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MAPEX Core Facility

MAPEX Core Facility for Materials Analytics

  • Marco Schowalter about the Titan 80-300 ST:

    "We can image the atomic structures of materials, exploring how this leads to the functionality of devices ranging from light-emitting diodes (LEDs) to catalysts and high-power transistors."

    © Patrick Pollmeier, Universität Bremen

  • Lars Robben about the Stadi MP:

    "X-ray diffraction allows us to examine the structure of materials. With this knowledge, the structural origins of material properties can be identified and tuned."

    © Patrick Pollmeier, Universität Bremen

  • Isabell Grothaus about the CD Spectrometer:

    "We exploit the method to monitor structural changes in proteins upon changes in their environment, introduction of mutations or alterations in post-translational modifications."

    © Patrick Pollmeier, Universität Bremen

  • Marcos Toro about the AFM:

    "Atomic force microscopy lets us visualize surfaces at the atomic level, providing detailed topographical maps that reveal nanoscale features essential for cutting-edge research."

    © Patrick Pollmeier, Universität Bremen

  • Wolf-Achim Kahl about the Xradia 520 Versa:

    "3D insights into mineral textures help me to understand how reactive processes in the ocean crust influence the geochemistry of the rocks and ocean, and even the development of microbial habitats."

    © Patrick Pollmeier, Universität Bremen

  • Florian Krause about the Spectra 300:

    "We can uncover the precise structure of materials down to the range of picometers. This allows us to reveal details like electric fields inside nanostructures on the sub-atomic scale."

    © Patrick Pollmeier, Universität Bremen

  • Ella Schmidt about the D8 Advance X-ray Diffractometer:

    "We unravel past climate histories, investigate the absorption properties of porous materials, and explore the structural complexities of nanoparticles."

    © Patrick Pollmeier, Universität Bremen

  • Jon-Olaf Krisponeit about the Low-energy Electron Microscope:

    "I can visualize surfaces in real-time while growing structures or films on them. This allows me to study surface phenomena and thin films with great clarity."

    © Patrick Pollmeier, Universität Bremen

  • Jens Falta about the coupled STM, XPS, and LEED System:

    "We can probe the elemental composition, chemical states, and structure of surfaces. This offers insights critical for the development of advanced materials and coatings."

    © Patrick Pollmeier, Universität Bremen

  • Mangir Murshed about the LabRam ARAMIS:

    “Using the microfocus Raman spectroscopy, I analyze the fingerprints of molecules and crystals, revealing their chemical composition and structural details.”

    © Patrick Pollmeier, Universität Bremen

  • Marcos Toro about the coupled Raman-VSI Spectrometer:

    "Coupling two optical methods for the analysis of surfaces allows us to study the molecular composition and the topological features of a surface in one instrument."

    © Patrick Pollmeier, Universität Bremen

What is MAPEX-CF?

The MAPEX-CF allows scientists from several disciplines to share and access a wide range of high-performance scientific equipment capable of characterizing the structure and the chemical state of materials, ranging from entire components at the cm scale all the way down to the atomic resolution at the pm to nm scale.

More than a tool box:

We work together to push materials analytics beyond the state of the art in five investigation areas, coupling experimental characterization with materials modelling and simulation.

3D Materials Analytics

We use X-rays to non-destructively inspect the three-dimensional distribution of matter inside the object of investigation.

mehr
XRM picture
© Oliver Focke / University of Bremen

Electron Microscopy

We investigate our samples using high-energy electron beams to obtain images with resolution down to the atom scale.

mehr
Momentum resolved STEM
© Andreas Rosenauer / University of Bremen

Surface Analytics

We combine microscopic and spectroscopic techniques to monitor processes at materials surfaces.

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vertical Scanning Imaging and superimposed Raman Shift
© An­dre­as Lütt­ge / University of Bremen

Spectroscopy

We perform in-situ and real-time chemical, electronic and optical characterization of materials under different conditions, e.g. to identify and map different phases.

mehr
Spectroscopy picture
© Jens Falta / University of Bremen

X-ray Diffraction

We support structure investigations of materials from crystalline nanomaterials to macroscopic single crystals at ambient and non-ambient conditions.

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X-Ray Diffraction
© Thorsten Gesing / University of Bremen

Materials Modeling

We develop and apply computational methods from quantum mechanics to continuum theories to design and understand new materials and processes.

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Nanoparticles
© Lucio Colombi Ciacchi / University of Bremen

MAPEX-CF is part of the MAPEX Center For Materials and Processes of the University of Bremen.

MAPEX-CF is supported by the Deutsche Forschungsgemeinschaft and is listed under the RIsources portal.

Find analytical equipment available in the MAPEX groups using our Instrument Database.

Research Highlights and News

Growth and oxidation of ultra-thin Pt-Sn layers on Pt(111) by molecular and atomic oxygen
© 2025 Published by Elsevier B.V.
Spectroscopy|

Growth and oxidation of ultra-thin Pt-Sn layers on Pt(111) by molecular and atomic oxygen

Nicolas Braud, Lars Buß, Lindsay Richard Merte, Harald Wallander, Jon-Olaf Krisponeit, Thomas Schmidt, Edvin Lundgren, Jan Ingo Flege, Jens Falta

Ultramicroscopy 278 (2025): 114243

https://doi.org/10.1016/j.ultramic.2025.114243

The preparation of ultra-thin PtSn-alloyed layers by molecular beam…

Partial-to-fully oxidized spectrum of Ti3C2Tx MXene-derived TiO2 free-standing films for nonvolatile high endurance memristive data storage pic
© AIP Publishing
X-Ray Diffraction| Spectroscopy| Electron Microscopy|

Partial-to-fully oxidized spectrum of Ti₃C₂Tₓ MXene-derived TiO₂ free-standing films for nonvolatile high endurance memristive data storage

Kubra Sattar, Rabia Tahir, Muhammad Yousaf, Thorsten M. Gesing, M. Mangir Murshed, Syed Rizwan

Applied Physics Reviews 12 (2025): 041413

https://doi.org/10.1063/5.0293660

As an exemplary member of the MXene family belonging to the class of two-dimensional materials, titanium carbide (Ti3C2Tx)…

On-chip catalytic combustion of hydrogen using Pt and Ru quantum-crystallites on functionalized SiO2 aerogels pic
© This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence
X-Ray Diffraction| Electron Microscopy|

On-chip catalytic combustion of hydrogen using Pt and Ru quantum-crystallites on functionalized SiO₂ aerogels

Ana Luiza Silveira Fiates, Oliver Thüringer, Andreas Schander, Raphaell Moreira, Marco Schowalter, Wilke Dononelli, Konrad Krämer, Andreas Rosenauer, Thorsten M. Gesing, Michael J. Vellekoop

Journal of Materials Science: Materials in Engineering 20 (2025): 140 

https://doi.org/10.1186/s40712-025-0…

Gas phase synthesis of mixed Cu1.8S-ZnS particles and the terminal phases in the reducing atmosphere pic
© 2025 Published by Elsevier B.V.
X-Ray Diffraction| Electron Microscopy|

Gas phase synthesis of mixed Cu₁.₈S-ZnS particles and the terminal phases in the reducing atmosphere

Suman Pokhrel, Muhammad Ali Martuza, Jan Derk Groeneveld, Marco Schowalter, Andreas Rosenauer, Johannes Birkenstock, Lutz Mädler

Powder Technology 465 (2025): 121318

https://doi.org/10.1016/j.powtec.2025.121318

The synthesis of Cu₁.₈S, ZnS, and Cu₁.₈S-ZnS composite nanoparticles is achieved via r…

Reactive transport modelling of autogenous self-healing: Impact of portlandite content and degree of hydration article
© 2025 The Authors. Published by Elsevier Ltd.
3D Materials Analytics|

Reactive transport modelling of autogenous self-healing: Impact of portlandite content and degree of hydration

Daniel Lahmann, Wolf-Achim Kahl, Sylvia Keßler

Cement and Concrete Research 197 (2025): 107965 

https://doi.org/10.1016/j.cemconres.2025.107965

Autogenous self-healing of cracked concrete remains a highly uncertain phenomenon in building practice, with the influence of the binder composition and…

Controlled Synthesis of Copper Sulfide Nanoparticles in Oxygen-Deficient Conditions Using Flame Spray Pyrolysis (FSP) and Its Potential Application
© 2025 The Author(s). Small published by Wiley-VCH GmbH
X-Ray Diffraction| Electron Microscopy|

Controlled Synthesis of Copper Sulfide Nanoparticles in Oxygen-Deficient Conditions Using Flame Spray Pyrolysis (FSP) and Its Potential Application

Muhammad Ali Martuza, Suman Pokhrel, Jakob Stahl, Marco Schowalter, Andreas Rosenauer, Lutz Mädler

Small 21 (2025): 2409993

https://doi.org/10.1002/smll.202409993

The objective of this study is to investigate the influence of various process parameters, such as the fuel-to-oxygen ratio, precursor…

Sill Stacking in Subseafloor Unconsolidated Sediments and Control on Sustained Hydrothermal Systems: Evidence From IODP Drilling in the Guaymas Basin, Gulf of California
© 2025. The Author(s)
3D Materials Analytics| MAPEX Research Highlights|

Sill Stacking in Subseafloor Unconsolidated Sediments and Control on Sustained Hydrothermal Systems: Evidence From IODP Drilling in the Guaymas Basin, Gulf of California

Christophe Galerne, Alban Cheviet, Wolf-Achim Kahl, Christin Wiggers, Wolfgang Bach, Florian Neumann, Martine Buatier, Tobias W. Höfig, Daniel Lizarralde, Andreas Teske, Manet Peña-Salinas, Jens Karstens, Christoph Böttner, Christian Berndt, Ivano W. Aiello, Kathleen M. Marsaglia, Swanne…

research highlight pic morales 2025
© 2025 The Author(s). Published by IOP Publishing Ltd.
Spectroscopy|

Stabilization of Ce³⁺ cations via U–Ce charge transfer in mixed oxides: consequences on the thermochemical water splitting to hydrogen

Carlos Morales, Rudi Tschammer, Thomas Gouder, YongMan Choi, Dalaver Anjum, Aman Baunthiyal, Jon-Olaf Krisponeit, Jens Falta, Jan Ingo Flege, Hicham Idriss

J. Phys. Energy 7 (2025): 025012

https://doi.org/10.1088/2515-7655/adbad9

The work's objective is to enhance the generation of H2 via the…

Making parts on Mars: Laser processing of iron contaminated by regolith simulant pic
© 2025 The Authors. Published by Elsevier Ltd.
3D Materials Analytics| X-Ray Diffraction| Electron Microscopy|

Making parts on Mars: Laser processing of iron contaminated by regolith simulant

Askar Kvaratskheliya, Aleksandr Filimonov, Bruno Bianchini, Muchammad Izzuddin Jundullah Hanafi, Thorsten M. Gesing, Taisuke T. Sasaki, Piter Gargarella, Lutz Mädler, Ilya Okulov

Materials Today Advances 25 (2025): 100566

https://doi.org/10.1016/j.mtadv.2025.100566

Manufacturing pure metals on…

research highlight pic
© 2025 The Authors. Published by American Chemical Society. This publication is licensed under CC-BY 4.0
Surface Analytics|

High-Temperature Growth of CeOₓ on Au(111) and Behavior under Reducing and Oxidizing Conditions

Rudi Tschammer, Lars Buß, Emilia Pożarowska, Carlos Morales, Sanjaya D. Senanayake, Mauricio J. Prieto, Liviu C. Tănase, Lucas de Souza Caldas, Aarti Tiwari, Thomas Schmidt, Miguel A. Niño, Michael Foerster, Jens Falta, Jan Ingo Flege

J. Phys. Chem. C 129 (2025): 3583–3594

https://doi.org/10.1021/…

Effect of intrinsic heat treatment on the precipitate formation of X40CrMoV5–1 tool steel during laser-directed energy deposition: A coupled study of atom probe tomography and in situ synchrotron X-ray diffraction pic
© 2025 The Author(s). Published by Elsevier Ltd on behalf of Acta Materialia Inc.
3D Materials Analytics| Correlated Workflows| X-Ray Diffraction| Electron Microscopy|

Effect of intrinsic heat treatment on the precipitate formation of X40CrMoV5–1 tool steel during laser-directed energy deposition: A coupled study of atom probe tomography and in situ synchrotron X-ray diffraction

Antonio Carlos de F. Silveira, Lisa T. Belkacemi, Pedro José de Castro, Marco Schowalter, Rainer Fechte-Heinen, Jérémy Epp

Acta Materialia 283 (2025): 120488

https://doi.org/10.1016/j.actamat.2024.120488

Additively manufactured components are generally heat treated to remove the undesired…

Towards coupling agent-free composites made from regenerated cellulose/HDPE by UV radiation-induced cross-linking pic
© 2025 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group
Spectroscopy|

Towards coupling agent-free composites made from regenerated cellulose/HDPE by UV radiation-induced cross-linking

Raja Bade, Beate Gebert, Larisa Tsarkova, Thomas Bahners, Jochen S. Gutmann, Dietmar Koch, M. Mangir Murshed, Jörg Müssig

Composite Interfaces (2025): 1-21

https://doi.org/10.1080/09276440.2024.2448883

This research aims to enhance fibre-matrix adhesion in bio-based fibre-reinforced polyolefins…

Hexagons on rectangles: Epitaxial graphene on Ru pic
© 2025 The Authors. Published by Elsevier Ltd.
Spectroscopy| Surface Analytics|

Hexagons on rectangles: Epitaxial graphene on Ru(1010)

Lars Buß, Giovanni Zamborlini, Cathy Sulaiman, Moritz Ewert, Mirko Cinchetti, Jens Falta, Jan Ingo Flege

Carbon 231 (2025): 119600

https://doi.org/10.1016/j.carbon.2024.119600

Ruthenium is emerging as a promising candidate to replace copper in highly integrated electronics by enabling barrierless…

Plagioclase feldspars (Ca1-xNa x )(Al2-xSi2+x)O8: synthesis and characterizations of mechanical weathering relevant to Martian regolith pic
© 2024 Walter de Gruyter GmbH, Berlin/Boston
X-Ray Diffraction| Spectroscopy| Electron Microscopy|

Plagioclase feldspars (Ca₁₋ₓNaₓ)(Al₂₋ₓSi₂₊ₓ)O₈: synthesis and characterizations of mechanical weathering relevant to Martian regolith

Izzuddin Jundullah Hanafi, Mohammad Mangir Murshed, Lars Robben, Thorsten M. Gesing

Zeitschrift Für Kristallographie - Crystalline Materials (2024)

https://doi.org/10.1515/zkri-2024-0117

Plagioclase feldspars draw intensive research attention in planetary sciences because of their abundance in…

Characterization of structure and mixing in nanoparticle hetero-aggregates using convolutional neural networks: 3D-reconstruction versus 2D-projection article picture
© 2024 The Authors. Published by Elsevier B.V.
Electron Microscopy|

Characterization of structure and mixing in nanoparticle hetero-aggregates using convolutional neural networks: 3D-reconstruction versus 2D-projection

Christoph Mahr, Jakob Stahl, Beeke Gerken, Florian F. Krause, Marco Schowalter, Tim Grieb, Lutz Mädler, Andreas Rosenauer

Ultramicroscopy 265 (2024): 114020

https://doi.org/10.1016/j.ultramic.2024.114020

Structural and chemical characterization of nanomaterials provides important information for…

Synthesis, structural and spectroscopic characterization of defect-rich forsterite as a representative phase of Martian regolith pic
© This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence
Materials Modelling| X-Ray Diffraction| Spectroscopy|

Synthesis, structural and spectroscopic characterization of defect-rich forsterite as a representative phase of Martian regolith

Muchammad Izzuddin Jundullah Hanafi, Lorenzo Bastonero, Mohammad Mangir Murshed, Lars Robben, Wilke Dononelli, Andrea Kirsch, Nicola Marzari, Thorsten M. Gesing

IUCrJ 11 (2024): 977-990

https://doi.org/10.1107/S2052252524009722

Regolith draws intensive research attention because of its importance…

Photo Electrocatalytic Water Splitting Using Sn Doped In2S3 Homologous Series Synthesized in Oxygen Deficient Flame pic
© 2024 The Author(s). Advanced Functional Materials published by Wiley-VCH GmbH
X-Ray Diffraction| Electron Microscopy|

Photo Electrocatalytic Water Splitting Using Sn Doped In₂S₃ Homologous Series Synthesized in Oxygen Deficient Flame

Suman Pokhrel, Jakob Stahl, Lizhuo Wang, Rui Tang, Haoyue Sun, Malte Schalk, Marco Schowalter, Andreas Rosenauer, Jun Huang, Johannes Kiefer, Johannes Birkenstock, Lutz Mädler

Advanced Functional Materials (2024): 2411521

https://doi.org/10.1002/adfm.202411521

The innovative development of…

Composition and strain of the pseudomorphic α-phase intermediate layer at the Ga2O3/Al2O3 interface pic
© 2024, Author(s). This article is distributed under a Creative Commons Attribution (CC BY) license
Electron Microscopy|

Composition and strain of the pseudomorphic α-phase intermediate layer at the Ga₂O₃/Al₂O₃ interface

M. Schowalter, A. Karg, M. Alonso-Orts, J. A. Bich, S. Raghuvansy, M. S. Williams, F. F. Krause, T. Grieb, C. Mahr, T. Mehrtens, P. Vogt, A. Rosenauer, M. Eickhoff

APL Materials 12 (2024): 091104

https://doi.org/10.1063/5.0226857

We investigate the composition of α-phase intermediate layers at…

Mechanochemical synthesis of (Mg1−xFe x )2SiO4 olivine phases relevant to Martian regolith: structural and spectroscopic characterizations article picture
© 2024 Walter de Gruyter GmbH, Berlin/Boston
X-Ray Diffraction| Spectroscopy|

Mechanochemical synthesis of (Mg₁₋ₓFeₓ)₂SiO₄ olivine phases relevant to Martian regolith: structural and spectroscopic characterizations

Izzuddin Jundullah Hanafi, M. Mangir Murshed, Lars Robben, Thorsten M. Gesing

Zeitschrift für Kristallographie - Crystalline Materials (2024)

https://doi.org/10.1515/zkri-2024-0078

To fabricate metals from the base materials for future Mars exploration, synthesis of representative olivine phases…

Broadening the Realm of Nanoporous Gold Catalysts: Preparation and Properties When Emanating from AuCu as Parent Alloy article picture
© 2024 The Authors. ChemCatChem published by Wiley-VCH GmbH
X-Ray Diffraction| Spectroscopy| Electron Microscopy|

Broadening the Realm of Nanoporous Gold Catalysts: Preparation and Properties When Emanating from AuCu as Parent Alloy

Jorge Adrian Tapia Burgos, Christoph Mahr, Alex Ricardo Silva Olaya, Lars Robben, Marco Schowalter, Thorsten Gesing, Andreas Rosenauer, Gunther Wittstock, Arne Wittstock, Marcus Bäumer

ChemCatChem (2024): e202400280

https://doi.org/10.1002/cctc.202400280

Nanoporous gold (npAu) attracted…

Synergizing ICP-MS, STEM-EDXS, and SMPS single particle analytics exemplified by superlattice L10 Pt/Fe aerosol nanoparticles produced by spark ablation article text
© Creative Commons Attribution-NonCommercial 3.0 Unported Licence
Electron Microscopy|

Synergizing ICP-MS, STEM-EDXS, and SMPS single particle analytics exemplified by superlattice L1ₒ Pt/Fe aerosol nanoparticles produced by spark ablation

Vinzent Olszok, Philipp Rembe, Tim Grieb, Eshan J. Wijeyeratnam, Andreas Rosenauer, Alfred P. Weber 

Nanoscale Advances 6(15) 2024: 3895-3903

https://doi.org/10.1039/D4NA00276H

Spark ablation was used to continuously synthesize bimetallic L10 Pt/Fe nanoparticles in an aerosol process involving a…

Synthesis of a stable crystalline nitrene article pic
© 2024 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science.
X-Ray Diffraction|

Synthesis of a stable crystalline nitrene

Marvin Janssen, Thomas Frederichs, Marian Olaru, Enno Lork, Emanuel Hupf, Jens Beckmann 

Science 385(6706) (2024): 318-321

DOI: 10.1126/science.adp4963

Nitrenes are a highly reactive, yet fundamental, compound class. They possess a monovalent nitrogen atom and usually a short life span, typically…

In situ Low-Energy Electron Microscopy of Chemical Waves on a Composite V-oxide/Rh(110) Surface Article picture
© 2024 The Authors. ChemPhysChem published by Wiley-VCH GmbH
Surface Analytics|

In situ Low-Energy Electron Microscopy of Chemical Waves on a Composite V-oxide/Rh(110) Surface

Bernhard Von Boehn, Jon Olaf Krisponeit, Jens Falta, Ronald Imbihl

ChemPhysChem 25 (16) (2024): e202400186

https://doi.org/10.1002/cphc.202400186

Chemical wave patterns and V-oxide redistribution in catalytic methanol oxidation on a VOx/Rh(110) surface have been investigated in the 10−4 mbar…

Picture of the Publication
© 2024 Elsevier B.V.
Surface Analytics| Electron Microscopy|

Influence of surface orientation on the variability of olivine dissolution rates

Xiaodong Li, Xiaodong Shen, Qianqian Wang, Duyou Lu, Binbin Qian, Elisabete Trindade Pedrosa, Andreas Lüttge

Applied Surface Science 655 (2024): 159634

https://doi.org/10.1016/j.apsusc.2024.159634

Alkaline solid wastes containing olivine minerals can be suitable for CO2 mineralization due to…

Tuning the morphology and chemical distribution of Ag atoms in Au rich nanoparticles using electrochemical dealloying article pic
© This article is licensed under a Creative Commons Attribution 3.0 Unported Licence
Electron Microscopy|

Tuning the morphology and chemical distribution of Ag atoms in Au rich nanoparticles using electrochemical dealloying

Alexandra Dworzak, Paul Paciok, Christoph Mahr, Marc Heggen, Carsten Dosche, Andreas Rosenauer, Mehtap Oezaslan

Nanoscale 16(19) (2024): 9603-9616

https://doi.org/10.1039/D4NR00046C

Dealloying of Ag–Au alloy nanoparticles (NPs) strongly differs from the corresponding bulk alloy materials. Here,…

Atomic vs. sub-atomic layer deposition: impact of growth rate on the optical and structural properties of MoS2 and WS2 article picture
© 2024 IOP Publishing Ltd
Spectroscopy| Electron Microscopy|

Atomic vs. sub-atomic layer deposition: impact of growth rate on the optical and structural properties of MoS₂ and WS₂

Christian Tessarek, Tim Grieb, Florian F Krause, Christian Petersen,  Alexander Karg, Alexander Hinz, Niels Osterloh, Christian Habben, Stephan Figge, Jon-Olaf Krisponeit, Thomas Schmidt,  Jens Falta, Andreas Rosenauer, Martin Eickhoff

2D Materials 11(2) (2024): 025031

DOI: 10.1088/2053-1583/ad313…

sing convolutional neural networks for stereological characterization of 3D hetero-aggregates based on synthetic STEM data pic
© 2024 The Author(s). Published by IOP Publishing Ltd
Spectroscopy| Electron Microscopy|

Using convolutional neural networks for stereological characterization of 3D hetero-aggregates based on synthetic STEM data

Luke Fox, Tom Kirstein, Christoph Mahr, Orkun Furat, Valentin Baric, Andreas Rosenauer, Lutz Mädler, Volker Schmidt

Machine Learning: Science and Technology 5 (2024): 025007

https://doi.org/10.1088/2632-2153/ad38fd

The 3D nano/microstructure of materials can significantly influence their…

The Picture of Synthesis and characterization of (Pb1−xSr x )MnBO4: a structural and spectroscopic study (2024)
© 2024 Walter de Gruyter GmbH, Berlin/Boston
Materials Modelling| X-Ray Diffraction|

Synthesis and characterization of (Pb₁₋ₓ Srₓ )MnBO₄: a structural and spectroscopic study

Carla M, Uribe-Rincon, M Mangir Murshed, Thorsten M. Gesing

Journal of Crystallography - Crystalline Materials 239 (2024): 3-4

https://doi.org/10.1515/zkri-2023-0056

The presence of  ns 2  stereo-chemical active lone electron pairs (LEPs) causes asymmetric atomic environments around a given  p…

The Picture of GaN atomic electric fields from a segmented STEM detector: Experiment and simulation (2024)
© 2024 The Authors. Journal of Microscopy published by John Wiley & Sons Ltd on behalf of Royal Microscopical Society.
Spectroscopy| Electron Microscopy|

GaN atomic electric fields from a segmented STEM detector: Experiment and simulation

Tim Grieb, Florian F. Krause, Thorsten Mehrtens, Christoph Mahr, Beeke Gerken, Marco Schowalter, Bert Freitag, Andreas Rosenauer

Journal of Microscopy 295 (2024): 140-146

https://doi.org/10.1111/jmi.13276

Atomic electric fields in a thin GaN sample are measured with the centre-of-mass approach…

Atom counting based on Voronoi averaged STEM intensities using a crosstalk correction scheme article picture
© 2024 The Authors. Published by Elsevier B.V.
Electron Microscopy|

Atom counting based on Voronoi averaged STEM intensities using a crosstalk correction scheme

Florian F. Krause, Andreas Rosenauer

Ultramicroscopy 256 (2024): 113867

https://doi.org/10.1016/j.ultramic.2023.113867

If quantitative scanning transmission electron microscopy is used for very precise thickness measurements with atomic resolution, it is commonly referred to as »atom counting«.…

Growth, catalysis, and faceting of α-Ga2O3 and α-(InxGa1−x)2O3 on m-plane α-Al2O3 by molecular beam epitaxy pic
© 2024, Author(s). This article is distributed under a Creative Commons Attribution (CC BY) license.
X-Ray Diffraction| Spectroscopy| Surface Analytics| Electron Microscopy|

Growth, catalysis, and faceting of α-Ga₂O₃ and α-(InₓGa₁₋ₓ)₂O₃ on m-plane α-Al₂O₃ by molecular beam epitaxy

Martin S. Williams, Manuel Alonso-Orts, Marco Schowalter, Alexander Karg, Sushma Raghuvansy, Jon P. McCandless, Debdeep Jena, Andreas Rosenauer, Martin Eickhoff, Patrick Vogt 

APL Materials 12 (2024): 011120

https://doi.org/10.1063/5.0180041

The growth of α-Ga2O3 and α-(InxGa1−x)2O3 on m-plane…

Characterization of mixing in nanoparticle hetero-aggregates by convolutional neural networks pic
© 2024 The Authors. Nano Select published by Wiley-VCH GmbH
Electron Microscopy|

Characterization of mixing in nanoparticle hetero-aggregates by convolutional neural networks

Christoph Mahr, Jakob Stahl, Beeke Gerken, Valentin Baric, Max Frei, Florian F. Krause, Tim Grieb, Marco Schowalter, Thorsten Mehrtens, Einar Kruis, Lutz Mädler, Andreas Rosenauer

Nano Select 5 (2024): 2300128

https://doi.org/10.1002/nano.202300128

Formation of hetero-contacts between particles…

The Picture of Sputter-Deposited β-Ga₂O₃ Films With Al Top Electrodes for Resistive Random Access Memory Technology (2023)
© 2023, IEEE
Surface Analytics| Electron Microscopy|

Sputter-Deposited β-Ga₂O₃ Films With Al Top Electrodes for Resistive Random Access Memory Technology

Aman Baunthiyal, Jon Olaf Krisponeit, Alexander Karg, Seyed Majid Mahdian, Marco Schowalter, Thorsten Mehrtens, Martin Eickhoff, Andreas Rosenauer, Jens Falta

IEEE Xplore   (2023) 

Doi: 10.1109/NMDC57951.2023.10343972

Gallium oxide (β−Ga2O3) has been considered as a promising candidate for…

Picture Of Growth and characterization of sputter-deposited Ga2O3- based memristive devices 2023 Article
© 2023 Author(s). Published under an exclusive license by AIP Publishing.
Surface Analytics| Electron Microscopy|

Growth and characterization of sputter-deposited Ga₂O₃ -based memristive devices

Aman Baunthiyal, Jon-Olaf Krisponeit, Marco Schowalter, Thorsten Mehrtens, Alexander Karg, Andreas Rosenauer, Martin Eickhoff, Jens Falta

Applied Physics Letters 123 (2023): 213504

https://doi.org/10.1063/5.0170354

In the last few years, there has been significant interest in gallium oxide…

Figure from the paper of Guo et al.
© 2023 The authors. Advanced Engineering Materials published by Wiley-VCH GmbH
3D Materials Analytics| Spectroscopy|

Gold Nanoparticle-Coated Bioceramics for Plasmonically Enhanced Molecule Detection via Surface-Enhanced Raman Scattering

Tongwei Guo, Jonas Schmidt, Mohammad Mangir Murshed, Kurosch Rezwan, Michael Maas

Advanced Engineering Materials 25 (2023): 2300942

https://doi.org/10.1002/adem.202300942

Herein, feasibility of plasmonically enhanced molecule detection via surface-enhanced Raman scattering for ceramics that are…

Figure from the publication
© 2023 GeoScienceWorld
3D Materials Analytics|

Timing of carbon uptake by oceanic crust determined by rock reactivity

Elmar Albers, Svenja Jöns, Axel Gerdes, Andreas Klügel, Christoph Beier, Simone A. Kasemann, Wolfgang Bach

Geology 51 (2023): 875

https://doi.org/10.1130/G51238.1

Carbonate formation during the alteration of oceanic crust is a global CO2 sink. Its timing and controls are not well understood,…

Dispersal of endolithic microorganisms in vesicular volcanic rock: Distribution, settlement and pathways revealed by 3D X-ray microscopy pic
© 2023 The Authors. Terra Nova published by John Wiley & Sons Ltd.
3D Materials Analytics| MAPEX Research Highlights|

Dispersal of endolithic microorganisms in vesicular volcanic rock: Distribution, settlement and pathways revealed by 3D X-ray microscopy

Hinrich A. Schmid-Beurmann, Wolf-Achim Kahl, Wolfgang Bach, Magnus Ivarsson, Michael Ernst Böttcher, Jörn Peckmann

Terra Nova 35 (2023): 396–403

https://doi.org/10.1111/ter.12663

Pleistocene basanitic rocks of Vesteris Seamount in the Greenland Sea had been found to exhibit an endolithic habitat…

Figure from the publication
© The Author(s) 2023
Correlated Workflows| Spectroscopy| Electron Microscopy|

Correlative analysis on InGaN/GaN nanowires: structural and optical properties of self-assembled short-period superlattices

Manuel Alonso‑Orts, Rudolfo Hötzel, Tim Grieb, Matthias Auf der Maur, Maximilian Ries, Felix Nippert, Benjamin März, Knut Müller‑Caspary, Markus R. Wagner, Andreas Rosenauer, Martin Eickhoff

DiscoverNano 18 (2023): 27

https://doi.org/10.1186/s11671-023-03808-6

The influence of self-assembled…

Figure from the publication
© 2022 The Authors.
Spectroscopy|

Low‐energy electron microscopy intensity–voltage data – Factorization, sparse sampling and classification

Francesco Masia, Wolfgang Langbein, Simon Fischer, Jon-Olaf Krisponeit, Jens Falta

Journal of Microscopy  289 (2023): 91-106

https://doi.org/10.1111/jmi.13155

Low-energy electron microscopy (LEEM) taken as intensity–voltage (I–V) curves provides hyperspectral images of surfaces, which can be used…

Oxygen Storage by Tin Oxide Monolayers on Pt3Sn(111) pic
© 2023 The Authors. Published by American Chemical Society
Spectroscopy| Surface Analytics|

Oxygen Storage by Tin Oxide Monolayers on Pt₃Sn(111)

Lindsay R. Merte, Nicolas Braud, Lars Buß, Malthe Kjær Bisbo, Harald J. Wallander, Jon-Olaf Krisponeit, Jan Ingo Flege, Bjørk Hammer, Jens Falta, Edvin Lundgren

The Journal of Physical Chemistry C. 127(6) (2023): 2988-2994

https://doi.org/10.1021/acs.jpcc.2c09041

The high performance of…

Halide-sodalites: thermal expansion, decomposition and the Lindemann criterion pics
© 2022 Walter de Gruyter GmbH, Berlin/Boston
Materials Modelling| X-Ray Diffraction|

Halide-sodalites: thermal behavior at low temperatures and local deviations from the average structure

Marius Wolpmann, Martin Etter, Andrea Kirsch, Filippo Balzaretti, Wilke Dononelli, Lars Robben, Thorsten M. Gesing

Zeitschrift für Kristallographie - Crystalline Materials 238 (2023): 27 - 38

https://doi.org/10.1515/zkri-2022-0037

Sodalites of the general type |Na8X2|[T1T2O4]6 with X = Cl−, Br−,…

The image of Gas Atomization of Duplex Stainless Steel Powder for Laser Powder Bed Fusion (2023)
© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license
3D Materials Analytics|

Gas Atomization of Duplex Stainless Steel Powder for Laser Powder Bed Fusion

Chengsong Cui, Felix Stern, Nils Ellendt, Volker Uhlenwinkel, Matthias Steinbacher, Jochen Tenkamp, Frank Walther, Rainer Fechte-Heinen

Materials 16 (2023): 435

https://doi.org/10.3390/ma16010435

Duplex stainless steel powders for laser additive manufacturing have not been developed extensively.…

TEM
© The authors 2022.
Materials Modelling| Electron Microscopy|

Deformed Honeycomb Lattices of InGaAs Nanowires Grown on Silicon-on-Insulator for Photonic Crystal Surface-Emitting Lasers

Cristian Messina, Yongkang Gong, Oumaima Abouzaid, Bogdan-Petrin Ratiu, Tim Grieb, Zhao Yan, Andreas Rosenauer, Sang Soon Oh, Qiang Li

Advanced Optical Materials 11 (2022): 2201809

https://doi.org/10.1002/adom.202201809

Photonic crystals can be used to achieve high-performance surface-emitting…

LEEM images
© Reprinted with permission from ACS Appl. Nano Mater. 2022, 5, 12, 17702–17710. Copyright 2022 American Chemical Society.
In-situ, real-time investigations| Spectroscopy|

Growth Mechanism of Single-Domain Monolayer MoS₂ Nanosheets on Au(111) Revealed by In Situ Microscopy: Implications for Optoelectronics Applications

Moritz Ewert, Lars Buß, Jeppe V. Lauritsen, Jens Falta, and Jan Ingo Flege

ACS Appl. Nano Mater. 5 (2022): 17702–17710

https://doi.org/10.1021/acsanm.2c03584

The nucleation and growth of single-layer molybdenum disulfide single-domain nanosheets is investigated by in situ low-energy electron…

Abstract
© The authors 2022.
Correlated Workflows| Electron Microscopy|

New Perspectives for Evaluating the Mass Transport in Porous Catalysts and Unfolding Macro- and Microkinetics

Stefan Wild, Christoph Mahr, Andreas Rosenauer, Thomas Risse, Sergey Vasenkov, Marcus Bäumer

Catal Lett 153 (2023): 3405–3422

https://doi.org/10.1007/s10562-022-04218-6

In this article we shed light on newly emerging perspectives to characterize and understand the interplay of diffusive mass…

Figure from the publication
© 2022 Elsevier B.V. All rights reserved.
Electron Microscopy|

Dose efficient annular bright field contrast with the ISTEM method: A proof of principle demonstration

Florian F. Krause, Marco Schowalter, Beeke Gerken, Dennis Marquardt, Tim Grieb, Thorsten Mehrtens, Christoph Mahr, Andreas Rosenauer

Ultramicroscopy 245 (2023): 113661

https://doi.org/10.1016/j.ultramic.2022.113661

The ISTEM mode for TEM has been demonstrated to have several advantages in regard…

SEM image
© © 2022 The Authors. Zeitschrift für anorganische und allgemeine Chemie published by Wiley-VCH GmbH
Correlated Workflows| In-situ, real-time investigations| X-Ray Diffraction| Spectroscopy| Electron Microscopy|

On red tin (II) oxide: temperature-dependent structural, spectroscopic, and thermogravimetric properties

Sarah Wittmann, M. Mangir Murshed, Thorsten M. Gesing

Z. Anorg. Allg. Chem. 648 (2022): e20220031

https://doi.org/10.1002/zaac.202200311

Polycrystalline red tin(II)oxide (RSO) has been synthesized by a fast reflux method. X-ray powder diffraction (XRPD) data Rietveld refinement confirms the…

LEEM
© Reprinted with permission from the Journal of Physical Chemistry C 2022 126 (45), 19101-19112. Copyright 2022 American Chemical Society.
In-situ, real-time investigations| Spectroscopy|

Phase Separation within Vanadium Oxide Islands under Reaction Conditions: Methanol Oxidation at Vanadium Oxide Films on Rh(111)

Bernhard von Boehn, Anton Weißbach, Jon-Olaf Krisponeit, Jan Ingo Flege, Jens Falta, Luca Gregoratti, Matteo Amati, Patrick Zeller, and Ronald Imbihl

J. Phys. Chem. C. 126 (2022): 19101–19112

https://doi.org/10.1021/acs.jpcc.2c04174

Submonolayer coverages of V-oxide on Rh(111) condense during…

picture
© The Royal Society of Chemistry 2022
Correlated Workflows| In-situ, real-time investigations| X-Ray Diffraction|

Effects of iron substitution and anti-site disorder on crystal structures, vibrational, optical and magnetic properties of double perovskites Sr₂(Fe₁₋ₓNiₓ)TeO₆

Asmaa Zaraq, Duncan H. Gregory, Brahim Orayech, Josu M. Igartua, Abdeslam El Bouari, James D. Eales, Paul A. Bingham and Thorsten M. Gesing

Dalton Transactions 45 (2022): 4086

https://doi.org/10.1039/D2DT02447K

The double-perovskite series, Sr2(Fe1−xNix)TeO6 (x = 0, 0.25, 0.50, 0.75, and 1) has…

The İmage of Nano-crystalline precursor formation, stability, and transformation to mullite-type visible-light photocatalysts (2022)
© Open Access This article is licensed under a Creative Commons Attribution 4.0 International License
X-Ray Diffraction| Spectroscopy|

Nano-crystalline precursor formation, stability, and transformation to mullite-type visible-light photocatalysts

Thorsten M. Gesing, M. Mangir Murshed, Selina Schuh, Oliver Thüringer, Konrad Krämer, Tim Neudecker, Cecilia B. Mendive & Lars Robben 

Journal of Materials Science 57 (2022): 19280-19299

https://doi.org/10.1007/s10853-022-07854-w

A new precursor for the formation of mullite-type visible-light…

STEM images
© 2022 The Author(s).
Correlated Workflows| Electron Microscopy|

Investigation of the dealloying front in partially corroded alloys

Christoph Mahr, Jorge Adrian Tapia Burgos, Marco Schowalter, Arne Wittstock, Andreas Rosenauer

Materials Research Letters 10 (2022): 824-831

https://doi.org/10.1080/21663831.2022.2109941

Nanoporous gold as obtained by corrosion of alloys of gold and a less noble metal is a system with manifold…

The Picture of Enhanced weathering in the seabed: Rapid olivine dissolution and iron sulfide formation in submarine volcanic ash (2022)
© Mineralogical Society of America
3D Materials Analytics| Spectroscopy|

Enhanced weathering in the seabed: Rapid olivine dissolution and iron sulfide formation in submarine volcanic ash

Wolf-Achim Kahl, Andreas Klügel, Wolfgang Bach, Mangir Murshed

American Mineralogist 107 (2022): 1668–1680

https://doi.org/10.2138/am-2022-8057

In basaltic volcanic ash recovered from a seamount at 3000 m water depth, we discovered marcasite and pyrite precipitation within cavities that formed…

The Image of Angle-dependence of ADF-STEM intensities for chemical analysis of InGaN/GaN (2022)
© 2022 Elsevier B.V. All rights reserved.
Electron Microscopy|

Angle-dependence of ADF-STEM intensities for chemical analysis of InGaN/GaN

Tim Grieb, Florian F.Krause, Knut Müller-Caspary, Jan Philipp Ahl, Marco Schowalter, Oliver Oppermann, Joachim Hertkorn, Karl Engl, Andreas Rosenauer

Ultramicroscopy 238 (2022): 113503

https://doi.org/10.1016/j.ultramic.2022.113535

In this paper we perform angular resolved annular-dark field…

The Image of Towards the interpretation of a shift of the central beam in nano-beam electron diffraction as a change in mean inner potential (2022)
© 2022 Elsevier B.V. All rights reserved.
Electron Microscopy|

Towards the interpretation of a shift of the central beam in nano-beam electron diffraction as a change in mean inner potential

Christoph Mahr, Tim Grieb, Florian F. Krause, Marco Schowalter, Andreas Rosenauer

Ultramicroscopy 236 (2022): 113503

https://doi.org/10.1016/j.ultramic.2022.113503

The measurement of electric fields in scanning transmission electron microscopy (STEM) is a highly investigated field of research.…

Image nanoparticle
© Reprinted with permission from ACS Catal. 2022, 12, 8, 4415–4429. Copyright 2022 American Chemical Society
Electron Microscopy|

Promoting Effect of the Residual Silver on the Electrocatalytic Oxidation of Methanol and Its Intermediates on Nanoporous Gold

Alex Ricardo Silva Olaya, Franziska Kühling, Christoph Mahr, Birthe Zandersons, Andreas Rosenauer, Jörg Weissmüller, Gunther Wittstock

ACS Catal. 12 (2022): 4415–4429

https://doi.org/10.1021/acscatal.1c05160

Nanoporous gold (NPG) obtained by dealloying Ag75Au25 with an overall residual Ag content…

Picture
© Reprinted with permission from https://doi.org/10.1021/acs.cgd.2c00030. Copyright 2022 American Chemical Society.
X-Ray Diffraction|

Revisiting the Growth of Large (Mg,Zr):SrGa₁₂O₁₉ Single Crystals: Core Formation and Its Impact on Structural Homogeneity Revealed by Correlative X-ray Imaging

Christo Guguschev, Carsten Richter, Mario Brützam, Kaspars Dadzis, Christian Hirschle, Thorsten M. Gesing, Michael Schulze, Albert Kwasniewski, Jürgen Schreuer, Darrell G. Schlom

Crystal Growth and Design 22 (2022): 2557–2568

https://doi.org/10.1021/acs.cgd.2c00030

We demonstrate the growth of…

Picture
© 2022 The Authors. Published by Elsevier Ltd on behalf of European Ceramic Society.
Spectroscopy|

Plasmonic porous ceramics based on zirconia-toughened alumina functionalized with silver nanoparticles for surface-enhanced Raman scattering

Tongwei Guoa, Md Nurul Karim, Kowsik Ghosh, M. Mangir Murshed, Kurosch Rezwan, Michael Maas

Open Ceramics 9 (2022): 100228

https://doi.org/10.1016/j.oceram.2022.100228

We demonstrate the feasibility of plasmonic porous ceramics which combine the optical properties of plasmonic nanoparticles with…

Halide-sodalites: thermal expansion, decomposition and the Lindemann criterion pics
© 2022 Walter de Gruyter GmbH, Berlin/Boston
X-Ray Diffraction|

Halide-sodalites: thermal expansion, decomposition and the Lindemann criterion

Marius Wolpmann, Lars Robben, Thorsten M. Gesing

Zeitschrift für Kristallographie - Crystalline Materials 237 (2022): 1-3

https://doi.org/10.1515/zkri-2022-0004

Twelve cubic sodalites |Na8X2|[T1T2O4]6 (T1 = Al3+, Ga3+; T2 = Si4+, Ge4+; X = Cl−, Br−, I−) were examined using high-temperature (HT)…

Picture
© 2021 The Authors. Journal of the American Ceramic Society published by Wiley Periodicals LLC on behalf of American Ceramic Society
Spectroscopy|

Structural, vibrational, thermal, and magnetic properties of mullite-type NdMnTiO₅ ceramic

Kowsik Ghosh, M. Mangir Murshed, Thomas Frederichs, Naveen K. C. Muniraju, Thorsten M. Gesing

Journal of the American Ceramic Society 105 (2021): 2702-2712

https://doi.org/10.1111/jace.18261

Mullite-type RMn2O5 (R = Y, rare-earth element) ceramics are of ongoing research attention because of…

Thermal anomalies and phase transitions in Pb2Sc2Si2O9 and Pb2In2Si2O9 pic
© 2021 Walter de Gruyter GmbH, Berlin/Boston
X-Ray Diffraction| Spectroscopy|

Thermal anomalies and phase transitions in Pb₂Sc₂Si₂O₉ and Pb₂In₂Si₂O₉

Mathias Gogolin, M. Mangir Murshed, Lkhamsuren Bayarjargal, Detlef Klimm, Thorsten M. Gesing

Zeitschrift für Kristallographie - Crystalline Materials 236 (2021): 283-292

https://doi.org/10.1515/zkri-2021-2046

Pb2Sc2Si2O9 and Pb2In2Si2O9, respectively, the scandium and indium containing structural…

Picture
© 2021 The Authors. Published by American Chemical Society
In-situ, real-time investigations| Spectroscopy|

Structural Transitions Driving Interface Pulses in Methanol Oxidation on Rh(110) and VOₓ/Rh(110): A LEEM Study

Bernhard von Boehn, Jon-Olaf Krisponeit, Jens Falta, Ronald Imbihl

Journal of Physical Chemistry C 125 (2021): 22539–22546

https://doi.org/10.1021/acs.jpcc.1c06106

With LEEM (low-energy electron microscopy) and micro-LEED as in situ techniques we have studied the structural transitions in the…

picture
© The Authors, licensed under CC BY-NC-ND 4.0
Surface Analytics|

The role of crystal heterogeneity in alkali feldspar dissolution kinetics

Isabel Lange, Marcos Toro, Rolf S.Arvidson, Inna Kurganskaya, Andreas Lüttge

Geochimica et Cosmochimica Acta 309 (2021): 329-351

https://doi.org/10.1016/j.gca.2021.06.032

Intrinsic heterogeneities of crystals almost always impose challenges on the investigation of dissolution kinetics. In the…

Influence of Processing Route on the Surface Reactivity of Cu47Ti33Zr11Ni6Sn2Si1 Metallic Glass pic
© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license
Surface Analytics|

Influence of Processing Route on the Surface Reactivity of Cu₄₇Ti₃₃Zr₁₁Ni₆Sn₂Si₁ Metallic Glass

Erika Soares Barreto, Volker Uhlenwinkel, Maximilian Frey, Isabella Gallino, Ralf Busch, Andreas Lüttge

Metals 11 (2021): 1173

https://doi.org/10.3390/met11081173

Recently, laser additive manufacturing (AM) techniques have emerged as a promising alternative for the synthesis of bulk metallic…

The Transition From MoS2 Single-Layer to Bilayer Growth on the Au(111) Surface pic
© This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).
Spectroscopy|

The Transition From MoS₂ Single-Layer to Bilayer Growth on the Au(111) Surface

Moritz Ewert, Lars Buß, Nicolas Braud, Asish K. Kundu, Polina M. Sheverdyaeva, Paolo Moras, Francesca Genuzio, Tevfik Onur Menteş, Andrea Locatelli, Jens Falta, Jan Ingo Flege

Front. Phys. 9 (2021): 654845

https://doi.org/10.3389/fphy.2021.654845

The transition from single-layer to bilayer growth…

The Image of Quantitative 3D Characterization of Nanoporous Gold Nanoparticles by Transmission Electron Microscopy (2021)
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Microscopy Society of America
Electron Microscopy|

Quantitative 3D Characterization of Nanoporous Gold Nanoparticles by Transmission Electron Microscopy

Christoph Mahr, Alexandra Dworzak, Marco Schowalter, Mehtap Oezaslan, Andreas Rosenauer

Microscopy and Microanalysis 27 (2021): 678 - 686

https://doi.org/10.1017/S1431927621000519

Quantitative structural characterization of nanomaterials is important to tailor their functional properties.…

Multiscale investigation of olivine (0 1 0) face dissolution from a surface control perspective pic
© 2021 Elsevier B.V. All rights reserved.
Correlated Workflows| Surface Analytics|

Multiscale investigation of olivine (0 1 0) face dissolution from a surface control perspective

Xiaodong Li, Qianqian Wang, Xiaodong Shen, Elisabete T.Pedrosa, Andreas Lüttge

Applied Surface Science 549 (2021): 149317

https://doi.org/10.1016/j.apsusc.2021.149317

The surface reaction of olivine materials is critical for their extensive applications in the global cycle of elements, future CO2…

The Image of Precise measurement of the electron beam current in a TEM (2021)
© 2021 Elsevier B.V. All rights reserved.
Electron Microscopy|

Precise measurement of the electron beam current in a TEM

Florian F. Krause, Marco Schowalter, Oliver Oppermann, Dennis Marquardt, Knut Müller-Caspary, Robert Ritz, Martin Simson, Henning Ryll, Martin Huth, Heike Soltau, Andreas Rosenauer

Ultramicroscopy 223 (2021): 113221

https://doi.org/10.1016/j.ultramic.2021.113221

Modern quantitative TEM methods…

The Image of Angle-resolved STEM using an iris aperture: Scattering contributions and sources of error for the quantitative analysis in Si (2021)
© 2021 Elsevier B.V. All rights reserved.
Electron Microscopy|

Angle-resolved STEM using an iris aperture: Scattering contributions and sources of error for the quantitative analysis in Si

Tim Grieb, Florian F. Krause, Knut Müller-Caspary, Saleh Firoozabadi, Christoph Mahr, Marco Schowalter, Andreas Beyer, Oliver Oppermann, Kerstin Volz, Andreas Rosenauer

Ultramicroscopy 221 (2021): 113175

https://doi.org/10.1016/j.ultramic.2020.113175

The angle-resolved electron scattering is…

3D model of rock fabric
© 2021 Elsevier B.V. All rights reserved.
3D Materials Analytics|

Morphological transition during prograde olivine growth formed by high-pressure dehydration of antigorite-serpentinite to chlorite-harzburgite in a subduction setting

Nicole Dilissen, Károly Hidas Carlos J. Garrido, Vicente López Sánchez-Vizcaíno, Wolf-Achim Kahl

Lithos 382-383 (2021): 105949

https://doi.org/10.1016/j.lithos.2020.105949

Crystal morphologies are essential for deciphering the reaction history of igneous and metamorphic rocks because they often…

The Image of Accurate measurement of strain at interfaces in 4D-STEM: A comparison of various methods (2021)
© 2021 Elsevier B.V. All rights reserved.
Electron Microscopy|

Accurate measurement of strain at interfaces in 4D-STEM: A comparison of various methods

Christoph Mahr, Knut Müller-Caspary, Tim Grieb, Florian F. Krause, Marco Schowalter, Andreas Rosenauer

Ultramicroscopy 221 (2021): 113196

https://doi.org/10.1016/j.ultramic.2020.113196

Strain analysis by nano-beam electron diffraction allows for measurements of strain with nanometre resolution in…

Eine kreisrunde Fläche aufgefächert
© 2020 Nature Scientific Reports
Spectroscopy|

The morphology of VO₂/TiO₂(001): terraces, facets, and cracks

Jon-Olaf Krisponeit, Simon Fischer, Sven Esser, Vasily Moshnyaga, Thomas Schmidt, Louis F. J. Piper, Jan Ingo Flege, Jens Falta

Nature Scientific Reports 10 (2020): 22374

https://doi.org/10.1038/s41598-020-78584-9

Vanadium dioxide (VO2) features a pronounced, thermally-driven metal-to-insulator…

Picture
© Copyright 2020 American Chemical Society
X-Ray Diffraction| Spectroscopy|

KLi₂RE(BO₃)₂ (RE = Dy, Ho, Er, Tm, Yb, and Y): Structural, Spectroscopic, And Thermogravimetric Studies on a Series of Mixed-Alkali Rare-Earth Orthoborates

Pengyun Chen, M. Mangir Murshed, Michael Fischer, Thomas Frederichs, Thorsten M. Gesing

Inorg. Chem 59 (2020): 18214–18224

https://doi.org/10.1021/acs.inorgchem.0c02684

We report a detailed structural, spectroscopic, and thermogravimetric investigation of a new series of mixed-alkali rare-earth…

Crystal structure and temperature-dependent properties of Na2H4Ga2GeO8 – a novel gallogermanate pic
© 2020 Walter de Gruyter GmbH, Berlin/Boston
X-Ray Diffraction|

Crystal structure and temperature-dependent properties of Na₂H₄Ga₂GeO₈ – a novel gallogermanate

Irma Peschke, Lars Robben, Christof Köhler, Thomas Frauenheim, Josef-Christian Buhl, Thorsten M. Gesing

Zeitschrift für Naturforschung B 75 (2020): 9-10

https://doi.org/10.1515/znb-2020-0159

Synthesis, crystal structure and temperature-dependent behavior of Na2H4Ga2GeO8 are reported. This novel…

Electron Microscopy Figure
© 2020 Nature Scientific Reports
Electron Microscopy|

Influence of plasmon excitations on atomic-resolution quantitative 4D scanning transmission electron microscopy

Andreas Beyer, Florian F. Krause, Hoel L. Robert, Saleh Firoozabadi, Tim Grieb, Pirmin Kükelhan, Damien Heimes, Marco Schowalter, Knut Müller-Caspary, Andreas Rosenauer, Kerstin Volz

Nature Scientific Reports 10 (2020): 17890

https://doi.org/10.1038/s41598-020-74434-w

Scanning transmission…

On the nature of the phase transitions of aluminosilicate perrhenate sodalite pic
© 2020 Walter de Gruyter GmbH, Berlin/Boston
X-Ray Diffraction|

On the nature of the phase transitions of aluminosilicate perrhenate sodalite

Hilke Petersen, Lars Robben, Thorsten M. Gesing

Zeitschrift für Kristallographie - Crystalline Materials 235 (2020): 6-7

https://doi.org/10.1515/zkri-2020-0027

The temperature-dependent structure-property relationships of the aluminosilicate perrhenate sodalite |Na8(ReO4)2|[AlSiO4]6 (ReO4-SOD)…

3D printing colloidal assembly
© 2020 Advanced Engineering Materials
3D Materials Analytics|

Strong Macroscale Supercrystalline Structures by 3D Printing Combined with Self‐Assembly of Ceramic Functionalized Nanoparticles

Berta Domènech, Alvin T. L. Tan, Hans Jelitto, Eduardo Zegarra Berodt, Malte Blankenburg, Oliver Focke, Jaclyn Cann, C. Cem Tasan, Lucio Colombi Ciacchi, Martin Müller, Kaline P. Furlan, A. John Hart, Gerold A. Schneider

Advanced Engineering Materials 22 (2020): 2000352

https://doi.org/10.1002/ade…

Adsorption of sulfur on Si(111) pic
© 2020 Elsevier B.V. All rights reserved
Spectroscopy|

Adsorption of sulfur on Si(111)

Th. Schmidt, L. Buß, M. Ewert, G. Schönhoff, T. Wehling. J. Falta

Surface Science 694 (2020): 121561

https://doi.org/10.1016/j.susc.2019.121561

The adsorption of S on Si(111)- 7  ×  7 has been investigated for different preparation schemes and parameters. S was supplied from an electrochemical Ag…

3D Material Analyse
© Wolf-Achim Kahl
3D Materials Analytics|

Crystal surface reactivity analysis using a combined approach of X-ray micro-computed tomography and vertical scanning interferometry

Wolf-Achim Kahl, Tao Yuan, Till Bollermann, Wolfgang Bach, Cornelius Fischer

American Journal of Science 320 (2020): 27-52

doi: 10.2475/01.2020.03 

Dissolution rates of porous crystalline materials reflect the superposition of transport and surface control, mainly via the parameters saturation of…

Controlling the Multiscale Structure of Nanofibrous Fibrinogen Scaffolds for Wound Healing pic
© 2019 American Chemical Society
Spectroscopy|

Controlling the Multiscale Structure of Nanofibrous Fibrinogen Scaffolds for Wound Healing

Karsten Stapelfeldt, Stephani Stamboroski, Irina Walter, Naiana Suter, Thomas Kowalik, Monika Michaelis and Dorothea Brüggemann

Nano Letters (2019) 19, 6554–6563

https://doi.org/10.1021/acs.nanolett.9b02798

As a key player in blood coagulation and tissue repair, fibrinogen has gained increasing…

Picture of A new test system for unraveling the effects of soil components on the uptake and toxicity of silver nanoparticles (NM-300K) in simulated pore water
© 2017 Science of The Total Environment
3D Materials Analytics|

A new test system for unraveling the effects of soil components on the uptake and toxicity of silver nanoparticles (NM-300K) in simulated pore water

Moira S. McKee, Jan Köser, Oliver Focke, Juliane Filser

Science of The Total Environment (2019) 673, 13-621

https://doi.org/10.1016/j.scitotenv.2019.03.493

Fate, bioavailability and toxicity of silver nanoparticles (AgNP) are largely affected by soil properties. Here we focused on how these…

Starfish
© 2019 Journal of Anatomy
3D Materials Analytics|

Morphology, shape variation and movement of skeletal elements in starfish (Asterias rubens)

Lena Schwertmann, Oliver Focke, Jan‐Henning Dirks

Journal of Anatomy (2019) 234, 656-667

https://doi.org/10.1111/joa.12964

Starfish (order: Asteroidea) possess a complex endoskeleton composed of thousands of calcareous ossicles. These ossicles are embedded in a body wall mostly consisting of a…

picture
© 2019 Physical Review Letters
Electron Microscopy|

Electrical Polarization in AlN/GaN Nanodisks Measured by Momentum-Resolved 4D Scanning Transmission Electron Microscopy

Knut Müller-Caspary, Tim Grieb, Jan Müßener, Nicolas Gauquelin, Pascal Hille, Jörg Schörmann, Johan Verbeeck, Sandra Van Aert, Martin Eickhoff, Andreas Rosenauer

Physical Review Letters (2019) 122, 106102

https://doi.org/10.1103/PhysRevLett.122.106102

We report the mapping of polarization-induced…

Kinetic concepts for quantitative prediction of fluid-solid interactions pic
© 2019 Elsevier B.V. All rights reserved.
Surface Analytics|

Kinetic concepts for quantitative prediction of fluid-solid interactions

Andreas Lüttge, Rolf S. Arvidson, Cornelius Fischer, Inna Kurganskaya

Chemical Geology (2019) 504, 216-235

https://doi.org/10.1016/j.chemgeo.2018.11.016

In a unique “perspectives” format that examines both past and future, we appraise the field of crystal dissolution kinetics, showing how the…

picture
© 2019 Ultramicroscopy
Electron Microscopy|

Influence of distortions of recorded diffraction patterns on strain analysis by nano-beam electron diffraction

Christoph Mahr, Knut Müller-Caspary, Robert Ritz, Martin Simson, Tim Grieb, Marco Schowalter, Florian F. Krause, Anastasia Lackmann, Heike Soltau, Arne Wittstock, Andreas Rosenauer

Ultramicroscopy (2019) 196, 74-82

Images acquired in transmission electron microscopes can be distorted for various…

Kinetics of pipeline steel corrosion studied by Raman spectroscopy-coupled vertical scanning interferometry pic
© Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License
Surface Analytics|

Kinetics of pipeline steel corrosion studied by Raman spectroscopy-coupled vertical scanning interferometry

Janis Heuer & Andreas Lüttge 

npj Materials Degradation (2018) 2, 40

https://doi.org/10.1038/s41529-018-0061-2

The corrosion and degradation of materials, such as pipeline steel, have a strong effect on both the environment and the economy. The quantification of these processes can therefore…

Low-temperature anharmonicity and symmetry breaking in the sodalite |Na8I2|[AlSiO4]6 pic
© 2018 Walter de Gruyter GmbH, Berlin/Boston
X-Ray Diffraction|

Low-temperature anharmonicity and symmetry breaking in the sodalite |Na₈I₂|[AlSiO₄]₆

Lars Robben, Isaac Abrahams, Michael Fischer, Stephen Hull, Martin T. Dove und Thorsten M. Gesing

Zeitschrift für Kristallographie - Crystalline Materials (2018) 234, Heft 4

https://doi.org/10.1515/zkri-2018-2122

The aluminosilicate iodide sodalite |Na8I2|[AlSiO4]6 was examined by…

3D Analytics Picture
© 2018 Lithos
3D Materials Analytics|

Textural evolution during high-pressure dehydration of serpentinite to peridotite and its relation to stress orientations and kinematics of subducting slabs: Insights from the Almirez ultramafic massif

Nicole Dilissen, Károly Hidas, Carlos J.Garrido, Wolf-Achim Kahl,Vicente López Sánchez-Vizcaíno, José Alberto Padrón-Navarta

Lithos (2018) 320-321, 470-489

https://doi.org/10.1016/j.lithos.2018.09.033

The Almirez ultramafic massif (SE Spain) preserves the transformation of high-P antigorite…

Temperature-dependent Structural and Spectroscopic Studies of (Bi1–xFex)FeO3 pic
© 2018 American Chemical Society
X-Ray Diffraction|

Temperature-dependent Structural and Spectroscopic Studies of (Bi₁₋ₓFeₓ)FeO₃

Andrea Kirsch, M. Mangir Murshed, Melanie J. Kirkham, Ashfia Huq, F. Jochen Litterst and Thorsten M. Gesing

The Journal of Physical Chemistry C (2018) 122 (49), 28280–28291

https://doi.org/10.1021/acs.jpcc.8b05740

We report on temperature-dependent structural and spectroscopic features of (Bi1–xF…

Discrimination of Ceramic Surface Finishing by Vertical Scanning Interferometry pic
© 2018 University of Oxford
Surface Analytics|

Discrimination of Ceramic Surface Finishing by Vertical Scanning Interferometry

C. Ionescu, C. Fischer, V. Hoeck, A. Lüttge

Archaeometry (2019) 61

https://doi.org/10.1111/arcm.12410

Finishing techniques are significant markers of the technological ‘know‐how’ involved in the production of the traditional, clay‐based ceramic ware. In order to provide a reliable tool to…

3D Material Picture
© 2018 Computers & Geosciences
3D Materials Analytics|

Ambient occlusion – A powerful algorithm to segment shell and skeletal intrapores in computed tomography data

J.Titschack, D. Baum, K. Matsuyama, K. Boos, C. Färber, W.-A. Kahl, K. Ehrig, D. Meinel, C. Soriano, S.R. Stock

Computers & Geosciences (2018) 115, 75-87

https://doi.org/10.1016/j.cageo.2018.03.007

During the last decades, X-ray (micro-)computed tomography has gained increasing attention for the…

Electron Microscopy Figures
© 2018 Ultramicroscopy
Electron Microscopy|

Quantitative HAADF STEM of SiGe in presence of amorphous surface layers from FIB preparation

Tim Grieb, Moritz Tewes, Marco Schowalter, Knut Müller-Caspary, Florian F. Krause, Thorsten Mehrtens, Jean-Michel Hartmann, Andreas Rosenauer

Ultramicroscopy (2018) 184, 29-36

https://doi.org/10.1016/j.ultramic.2017.09.012

The chemical composition of four Si1-xGex layers grown on silicon was…

Structural and spectroscopic comparison between polycrystalline, nanocrystalline and quantum dot visible light photo-catalyst Bi2WO6 pic
© 2017 Elsevier Inc. All rights reserved.
X-Ray Diffraction|

Structural and spectroscopic comparison between polycrystalline, nanocrystalline and quantum dot visible light photo-catalyst Bi₂WO₆

Michael Teck, M. Mangir Murshed, Marco Schowalter, Niels Lefeld, Henrike K. Grossmann, Tim Grieb, Thomas Hartmann, Lars Robben, Andreas Rosenauer, Lutz Mädler, Thorsten M.Gesing

Journal of Solid State Chemistry (2017) 254, 82-89 

https://doi.org/10.1016/j.jssc.2017.07.013

The structural and…

Electron Microscopy Figure
© 2017 Journal of Catalysis
Electron Microscopy|

Quantitative determination of residual silver distribution in nanoporous gold and its influence on structure and catalytic performance

Christoph Mahr, Paromita Kundu, Anastasia Lackmann, Daniele Zanaga, Karsten Thiel, Marco Schowalter, Martin Schwan, Sara Bals, Arne Wittstock, Andreas Rosenauer

Journal of Catalysis (2017) 352, 52-58

https://doi.org/10.1016/j.jcat.2017.05.002

Large efforts have been made trying to understand the…

3D Material picture
© 2017 Fossil Record
3D Materials Analytics|

Classical and new bioerosion trace fossils in Cretaceous belemnite guards characterised via micro-CT

Max Wisshak, Jürgen Titschack, Wolf-Achim Kahl, Peter Girod

Fossil Record (2017) 20, 173–199

doi:10.5194/fr-20-173-2017

The ongoing technical revolution in non-destructive 3-D visualisation via micro-computed tomography (micro-CT) finds a valuable application in the studies of bioerosion trace…

3D Material Picture
© 2017 Journal of Microscopy
3D Materials Analytics|

3-D microstructure of olivine in complex geological materials reconstructed by correlative X-ray µ-CT and EBSD analyses

Kahl, W.-A., Dilissen, N., Hidas, K., Garrido, C. J., López-Sánchez-Vizcaíno, V. and Román-Alpiste, M. J.

Journal of microscopy (2017) 268, 193-207

https://doi.org/10.1111/jmi.12598

We reconstruct the 3‐D microstructure of centimetre‐sized olivine crystals in rocks from the Almirez ultramafic…

3D Material Picture
© 2017 Lithos
3D Materials Analytics|

Reaction-induced porosity and onset of low-temperature carbonation in abyssal peridotites: insights from 3D high-resolution microtomography

Niels Jöns, Wolf-Achim Kahl, Wolfgang Bach

Lithos (2016) 268-271, 274-284.

https://doi.org/10.1016/j.lithos.2016.11.014

In a drillcore sample of serpentinized harzburgite from the uppermost oceanic crust (Mid-Atlantic Ridge, ODP Leg 209, Site 1270), we demonstrate using high-resolution…

LEEm picture
© 2017 Physical Chemistry Chemical Physics
Spectroscopy|

Growth and structure of ultrathin praseodymium oxide layers on ruthenium (0001)

Jan Höcker, Jon-Olaf Krisponeit, Julian Cambeis, Alexei Zakharov, Yuran Niu, Gang Wei, Lucio Colombi Ciacchi, Jens Falta, Andreas Schaefer and Jan Ingo Flege 

Physical Chemistry Chemical Physics (2017) 19, 3480-3485

https://doi.org/10.1039/C6CP06853G

The growth, morphology, structure, and…

xps spectra
© Jens Falta / Universität Bremen
Spectroscopy|

Isotropic thin PTCDA films on GaN(0001)

C. Ahrens, J. I. Flege, C. Jaye, D. A. Fischer, T. Schmidt and J. Falta

Journal of Physics: Condensed Matter (2016) 28, 475003

https://doi.org/10.1088/0953-8984/28/47/475003

The growth of 3, 4, 9, 10-perylene tetracarboxylic dianhydride (PTCDA) on the Ga-polar GaN(0 0 0 1) surface has been…

3D Material Picture
© 2016 Lithos
3D Materials Analytics|

A new X-ray-transparent flow-through reaction cell for a μ-CT-based concomitant surveillance of the reaction progress of hydrothermal mineral–fluid interactions

Wolf-Achim Kahl, Christian Hansen, Wolfgang Bach

Solid Earth (2016) 7, 651-658

doi:10.5194/se-7-651-2016

A new flow-through reaction cell consisting of an X-ray-transparent semicrystalline thermoplastic has been developed for percolation experiments. Core holder, tubing and all confining parts…

Electron Microscopy Figure
© 2014 Nature Communications
Electron Microscopy|

Atomic electric fields revealed by a quantum mechanical approach to electron picodiffraction

Knut Müller, Florian F. Krause, Armand Béché, Marco Schowalter, Vincent Galioit, Stefan Löffler, Johan Verbeeck, Josef Zweck, Peter Schattschneider & Andreas Rosenauer 

Nature Communications (2014) 5, 5653

doi: 10.1038/ncomms6653

By focusing electrons on probes with a diameter of 50 pm,…

Electron Microscopy Figure
© 2014 Phys. Rev. Lett.
Electron Microscopy|

Conventional Transmission Electron Microscopy Imaging beyond the Diffraction Limit and Information Limits

Andreas Rosenauer, Florian F. Krause, Knut Müller, Marco Schowalter, Thorsten Mehrtens

Physical Review Letters (2014) 113, 096101

doi: 10.1103/PhysRevLett.113.096101

There are mainly two complementary imaging modes in transmission electron microscopy (TEM): Conventional TEM (CTEM) and scanning…

for further research highlights, click here

Instrumentation co-funded by MAPEX

In 2025, a number of instruments were co-funded by MAPEX in the framework of the "Materials on Demand" project. Here, we present a regularly-updated overview of the instrumentation supported like this.

Potrait of the Instrument - ZEISS EM900
© Universität Bremen

Zeiss EM900 - Transmission Electron Microscope

A complete overhaul of the Zeiss EM900 TEM was funded by MAPEX

Transmission electron microscopy is an established technique for imaging of nanoscale materials using a beam of electrons that is transmitted through the specimen.

The upgrade includes:  Complete replacement of the previous control…

Picture of Ellipsometer
© Universität Bremen

Ellipsometer

The repair of the pictured UVISEL 2 ellipsometer from Horiba was funded.

Feature: This ellipsometer is a highly automated, spectroscopic ellipsometer for the wavelength range of 190 - 2100 nm.

Measured quantity: The ellipsometer is a micro-spot ellipsometer, which can achieve very small spot sizes…

Picture of Integrating sphere
© Universität Bremen

Integrating sphere

An integrating sphere for the Fluorolog 3 spectrometer from Horiba was funded.

The integrating sphere is shown in the photo and can be inserted directly by the user in the form of an insert into the Flurolog 3 spectrometer from AG Callsen, which considerably simplifies operation.

Measured…

Acoustic emission measuring system AMSY-6
© Universität Bremen

Acoustic emission

The newly acquired AE measuring system AMSY-6 from Vallen Systeme GmbH was funded.

Acoustic emission (AE) monitoring is a powerful technique for structural health monitoring of components and in-situ microstructural analysis of complex materials.

Measured quantity: The newly acquired AE measuring…

Instrument manager

Dr. Wilken Seemann

University of Bremen
IW3, Room 2190
Am Biologischen Garten 2
28359 Bremen
Phone: +49 421 218 64954
E-Mail: Instrument Manager

Science manager

Dr. Hanna Lührs

University of Bremen
IW3-Building, Room 2230
Am Biologischen Garten 2
28359 Bremen
Phone: +49 421 218 64580
E-Mail: MAPEX

Scientific coordinator

Prof. Dr.-Ing. Lucio Colombi Ciacchi

University of Bremen
TAB-Building, Room 3.30
Am Fallturm 1
28359 Bremen
Phone: +49 421 218 64570
E-Mail: Scientific coordinator

Aktualisiert von: MAPEX
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