
Joerg R. JinschekTechnical University of Denmark | DTU · DTU Danchip & the Center for Electron Nanoscopy (CEN)
Joerg R. Jinschek
Dr. rer. nat.
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171
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Introduction
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September 2021 - September 2021
January 2017 - August 2021
September 1996 - July 2001
Publications
Publications (171)
Intensities in high-resolution phase-contrast images from electron microscopes build up discretely in time by detecting single electrons. A wave description of pulse-like coherent-inelastic interaction of an electron with matter implies a time-dependent coexistence of coherent partial waves. Their superposition forms a wave package by phase decoher...
Based on historical developments and the current state of the art in gas-phase transmission electron microscopy (GP-TEM), we provide a perspective covering exciting new technologies and methodologies of relevance for chemical and surface sciences. Considering thermal and photochemical reaction environments, we emphasize the benefit of implementing...
In this study, three-dimensional functionally graded NiTi bulk materials were fabricated using laser powder bed fusion (LPBF) by in-situ adding Ni powder into equiatomic NiTi powder. The gradient zone exhibited a Ni composition ranging from approximately 49.6 to 52.4 at.% over a distance of about 2.75 mm. The functionalities along the compositional...
The successful development of a metal–organic framework (MOF)-derived Co/Co3O4/C core–shell composite integrated into laser-induced graphitic (LIG) carbon electrodes for electrochemical sensing is reported. The sensors are fabricated via a direct laser scribing technique using a UV laser (355 nm wavelength) to induce the photothermolysis of rationa...
Scanning Electron Microscopy (SEM) experiments provide detailed insights into material microstructures, enabling high-resolution imaging as well as crystallographic analysis through advanced techniques like Electron Backscatter Diffraction (EBSD). However, the interaction of the high-energy electron beam with the material can lead to localized heat...
Zeolitic-imidazolate frameworks (ZIFs) are crystalline microporous materials with promising potential for gas adsorption and catalysis application. Further research advances include studies on integrating ZIFs into nanodevice concepts. In detail for the application, e.g., electron-beam-assisted structural modifications or patterning, there is a nee...
Zinc (Zn) emerges as an ideal anode for aqueous‐based energy storage devices because of its safety, non‐toxicity, and cost‐effectiveness. However, the reversibility of zinc anodes is constrained by unchecked dendrite proliferation and parasitic side reactions. To minimize these adverse effects, a highly oriented, crystalline 2D porous fluorinated c...
Advances in analytical scanning transmission electron microscopy (STEM) and microelectronic mechanical systems (MEMS) based microheaters have enabled in-situ materials characterization at the nanometer scale at elevated temperature. In addition to resolving the structural information at elevated temperatures, detailed knowledge of the local tempera...
Zeolitic-imidazolate-frameworks (ZIFs) are crystalline microporous materials that have already shown promising application potential in areas such as gas adsorption and catalysis. Further research advances include studies on integrating ZIFs into nanodevice concepts. In detail for the application e.g. of electron-beam-assisted structural modificati...
Epsilon tungsten trioxide (ε-WO3) has drawn much attention for its unique gas sensing and ferroelectric properties. However, the strong metastability of ε-phase makes it extremely difficult to stabilize the phase at room temperature. For a long time, it was believed that the ε-phase can only be stabilized by rapid solidification processing. In this...
Understanding the size-dependent behavior of nanoparticles is crucial for optimizing catalytic performance. We investigate the differences in selectivity of size-selected gold nanoparticles for CO2 electroreduction with sizes ranging from 1.5 to 6.5 nm. Our findings reveal an optimal size of approximately 3 nm that maximizes selectivity toward CO,...
Although gamma-alumina (γ-Al2O3) is an extensively used material with wide-ranging applications due to its inherently high surface area and acidity, its atomic structure is still not fully understood. γ-Al2O3 is described as having a spinel-like structure, where the O sublattice has a face-centered cubic (FCC) arrangement and Al cations are placed...
Principally, any study of nanostructured catalysts benefits tremendously from the application of electron microscopy with atomic resolution because a high spatiotemporal, optical, and energy resolution allows accessing structural and chemical information about catalyst surfaces and buried interfaces. Moreover, the introduction of environmental cells...
Hexagonal tungsten trioxide (h-WO3) has shown great potential for application in electrochromic devices, gas sensors, battery electrodes, and as photo-catalysts. The h-WO3 structure features a unique large network of open hexagonal channels that allow for intercalation. The hydrothermal synthesis of h-WO3 using sodium tungstate dihydrate as a precu...
The relation between the energy-dependent particle and wave descriptions of electron–matter interactions on the nanoscale was analyzed by measuring the delocalization of an evanescent field from energy-filtered amplitude images of sample/vacuum interfaces with a special aberration-corrected electron microscope. The spatial field extension coincided...
Autonomous experimentation systems have been used to greatly advance the Integrated Computational Materials Engineering paradigm. This paper outlines a framework that enables the design and selection of data collection workflows for autonomous experimentation systems. The framework first searches for data collection workflows that generate high-qua...
Nanosized metal aggregates (MAs), including metal nanoparticles (NPs) and nanoclusters (NCs), are often the active species in numerous applications. In order to maintain the active form of MAs in "use", they need to be anchored and stabilised, preventing agglomeration. In this context, metal-organic frameworks (MOFs), which exhibit a unique combina...
Strengthening effects in materials bonded by the high strain rate plastic deformation process, Ultrasonic Additive Manufacturing (UAM), were investigated. Aluminum (Al 6061) was pretreated by tempering and annealing prior to bonding through UAM. Following UAM, multiscale material characterization was performed. Tensile testing in the rolling (x) di...
The correlation between particle and wave descriptions of electron-matter interactions is analyzed by measuring the delocalization of an evanescent field using electron microscopy. Its spatial extension coincides with the energy-dependent, self-coherence length of propagating wave packets that obey the time-dependent Schr\"odinger equation and unde...
Initially, vanadium dioxide seems to be an ideal first-order phase transition case study due to its deceptively simple structure and composition, but upon closer inspection there are nuances to the driving mechanism of the metal-insulator transition (MIT) that are still unexplained. In this study, a local structure analysis across a bulk powder tun...
Autonomous experimentation systems have been used to greatly advance the integrated computational materials engineering (ICME) paradigm. This paper outlines a framework that enables the design and selection of data collection workflows for autonomous experimentation systems. The framework first searches for data collection workflows that generate h...
The methodology to modify a commercially available MEMS-based heating device, to generate nanoscale thermal gradients across a FIB cut specimen inside the TEM is described. Infra-red thermal imaging experiment were performed on modified and unmodified MEMS based heating devices to measure thermal gradients across the device. The mean temperature me...
Ferroelectric nanostructured ε phase tungsten trioxide (ε-WO3) is emerging as an important functional material with unique gas sensing and optoelectronic properties. However, ε-WO3 phase is typically unstable in the bulk at room temperature (RT) and it has only been produced at ambient conditions by rapid solidification processes, such as Flame Spr...
A nanocomposite comprised of molybdenum oxide and highly conductive carbon (MoOx/Carbon) was deposited onto a screen-printed gold electrode (SPGE) to be employed as a gas sensor for the detection of formaldehyde gas. First, the carbon surface was modified by acid treatment to introduce oxygen-containing groups and promote the efficient anchorage of...
Ni based catalysts have been widely studied for H2 production due to the ability of Ni to break C-C and C-H bonds. In this work, we study inverse catalysts prepared by well-controlled sub-monolayer deposition of CeO2 nanocubes onto Ni thin films for ethanol steam reforming (ESR). Results show that controlling the coverage of CeO2 nanocubes on Ni en...
A compositionally complex alloy was designed, consisting of equiatomic concentrations of four low-cost commodity elements (Al, Fe, Mn, and Si). The alloy was characterized using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The corrosion of the AlFeMnSi alloy, as evaluated using potentiodynamic polarization tests and electr...
It is well known that an excess of hydroxyl radicals (˙OH) in the human body is responsible for oxidative stress-related diseases. An understanding of the relationship between the concentration of ˙OH and those diseases could contribute to better diagnosis and prevention. Here we present a supersensitive nanosensor integrated with an electrochemica...
The hexagonal WO3 polymorph, h-WO3, has attracted attention due to its interatomic channels, allowing for a greater degree of intercalation compared to other WO3 polymorphs. Our research group has previously demonstrated h-WO3 to be a highly sensitive gas sensing material for a flu biomarker, isoprene. In this work, the gas sensing performance of t...
For polymorphic binary metal oxides, such as HfO2, the availability of metastable phases with distinct physical and chemical properties opens a wide field of new applications. Hafnia (HfO2) is used as a thermal barrier coating in high temperature structural materials and as an electronic material (gate oxide) in the metal-oxide semiconductor field-...
Ceria-zirconia (CZO) materials remain as a crucial component of today’s three-way catalysts (TWC). To meet increasing stringent emission standards, pyrochlore-phase CZO (pyr-CZO) was examined as a superior oxygen storage capacity (OSC) material over traditional tetragonal-phase CZO (t-CZO) used in today’s automotive catalysts. By reducing t-CZO at...
Gamma-alumina (γ-Al2O3), like other low-Z oxides, is readily damaged when exposed to an electron beam. This typically results in the formation of a characteristic pre-edge peak in the oxygen-K edge of electron energy-loss spectra (EELS) acquired during or after the damage process. This artifact can mask the presence of intrinsic O-K edge fine struc...
AM Ti-6Al-4V exhibits a (more) homogenous microstructure when manufactured using an EBM PBF spot scan strategy. • EBM spot scan strategies result in coarser α laths and finer prior β grains, compared to raster scan strategy. • Spot scan strategies were found to result in a fiber texture, whereas raster scan results in a cube texture. • Observed dis...
Investigation of Solid-state Transformations Under Extreme Thermal Transients Using in-situ TEM Heating Experiments - Sriram Vijayan, Meiyue Shao, Rongxuan Wang, Zhenyu Kong, Joerg Jinschek
Revealing the Atomic Structure of Rh/𝛾-Al2O3 Catalysts Using Low Dose Rate Electron Microscopy - Cheng-Han Li, Jason Wu, Joerg Jinschek
Probing the Cation Distribution in Gamma-Alumina Enabled by O-K Edge Artifact Suppression Using Cryo-EELS - Henry Ayoola, Cheng-Han Li, Stephen House, Joshua Kas, John Rehr, Joerg Jinschek, Wissam Saidi, Judith Yang, Cecile Bonifacio
Determination of Polymorph Structures in Functional Metal Oxides using Convergent Beam Electron Diffraction - Zanlin Qiu, Abe Owen, Pelagia-Iren (Perena) Gouma, Joerg Jinschek
The Effect of Beam Scan Strategies on the Microstructure of EBM Additively Manufactured Inconel 738 - Chris Blackwell, Meiyue Shao, Sriram Vijayan, Sabina Kumar, Sudarsanam Babu, Joerg Jinschek
Ta-rich γ/MC eutectic is the predominant interdendritic constituent that forms upon solidification in Ni30Cr weld metal with Ta and Mo additions. In addition, a very small amount of sigma phase (σ) forms on weld solidification. These terminal solidification constituents were investigated in detail by a combination of various methods in transmission...
Metal-support interactions significantly affect the performance of heterogeneous catalysts, of which Pt supported on γ-Al2O3 is one of the most widely used. Characterizing the bonding of Pt on the γ-Al2O3 surface is key to fully understanding the catalyst-support interaction. Herein aberration-corrected and monochromated scanning transmission elect...
Quantitative Study on the Effect of Thermal Gradients on the Microstructure of Additively Manufactured Ti-6Al-4V Builds - Volume 25 Supplement - Meiyue Shao, Chris Blackwell, Sriram Vijayan, Sabina Kumar, Sudarsanam S. Babu, Joerg R. Jinschek
TEM Investigation on the Relationship Between Catalytic Activity and Structure in Rh/Al2O3 Catalysts - Volume 25 Supplement - Cheng-Han Li, Jason Wu, Chris Chae, Joerg R. Jinschek
In situ S/TEM Heating Experiments to Study the Effects of Cyclic Thermal Gradients in Additive Manufacturing Build Processes - Volume 25 Supplement - Joerg R. Jinschek, Sriram Vijayan, Meiyue Shao, Cheng-Han Li
TEM Investigation on Eutectic Phase Formation in Ni-30Cr Filler Metal 52XL - Volume 24 Supplement - Cheng-Han Li, Meiyue Shao, Carolin Fink, John C. Lippold, Joerg R. Jinschek
Atomic-Resolution Imaging of Heterogeneous Catalysts at Work - Volume 24 Supplement - S. Helveg, C. F. Elkjcer, S. P. Jespersen, S. Vendelbo, B. Hendriksen, L. Mele, P. Dona, J. F. Creemer, P. Kooyman, I. Chorkendorff, C. Damsgaard, J. R. Jinschek
Role of Electron Illumination on the Image Resolution and Sensitivity of Catalysts Immersed in Gas Environments - Volume 24 Supplement - S. P. Jespersen, M. Ek, J. R. Jinschek, B. Hendriksen, L. Mele, P. Dona, C. D. Damsgaard, S. Helveg
In-situ TEM Heating Experiment to Study Effects of Cyclic Thermal Gradients on Ti-6Al-4V under Additive Manufacturing Growth Conditions - Volume 24 Supplement - Meiyue Shao, Cheng-Han Li, Curtis L. Frederick, Sudarsanam S. Babu, Joerg R. Jinschek
Observing Catalyst Structures and Dynamics at Atomic-Resolution - Volume 24 Supplement - M. Ek, L. P. Hansen, F.-R. Chen, D. van Dyck, C. Kisielowski, J. R. Jinschek, S. Helveg
Micro-electro-mechanical system (MEMS)-based heating holders offer exceptional control of temperature and heating / cooling rates for TEM experiments. The use of such devices is relatively straightforward for nano-particulate samples, but the preparation of specimens from bulk samples by FIB milling presents significant challenges. These include: p...
Visualizing Redox Chemistry in Oxide Surfaces at Atomic-Resolution - Volume 23 Issue S1 - M. Ek, Q.M. Ramasse, L. Arnarson, P.G. Moses, C.F. Kisielowski, J.R. Jinschek, S. Helveg
TEM Specimen Preparation for In Situ Heating Experiments Using FIB - Volume 23 Issue S1 - Sriram Vijayan, Mark Aindow, Joerg R. Jinschek, Stephan Kujawa, Jens Greiser
Typical electron dose rates that are used to capture single high resolution images induce atom (column) displacements that greatly exceed the average atom displacements calculated from Debye–Waller factors at room temperature.
div class="title"> Atomic Scale In Situ Electron Microscopy: Challenges and Opportunities
- Volume 22 Issue S3 - Joerg R. Jinschek
We present advances in EM characterization by overcoming the typical challenges (e.g. charging, low contrast, beam sensitivity), thereby providing new nanoscale insights into polymer materials and structures.
Characterization methods utilizing Scanning / Transmission Electron Microscopes have become routine techniques to investigate interface structures in nanomaterials. High resolution imaging methods reveals atomic structure; while spectroscopy gives additional access to elemental distribution and chemical bonding. Focus behind these developments is t...
The introduction of scanning/transmission electron microscopes (S/TEM) with sub‐Angstrom resolution as well as fast and sensitive detection solutions support direct observation of dynamic phenomena in‐situ at the atomic scale. Thereby, in‐situ specimen holders play a crucial role: accurate control of the applied in‐situ stimulus on the nanostructur...
For materials science research a good understanding of the connection between the nanostructure of the material and its unique properties is important. Recent improvements in the performance and capabilities of STEM and TEM systems have increased the quality of the images and analytical data obtained and provided some exciting new capabilities, mak...