185 citations · 944 across the 28 of their papers we have counts for
30 papers
Stacking fault segregation imaging with analytical field ion microscopy
F. F. Morgado, L. T. Stephenson, S. Bhatt +8
Stacking faults (SF) are important structural defects that play an essential role in the deformation of engineering alloys. However, direct observation of stacking faults at the at…
Nanoporous gold thin films as substrates to analyze liquids by cryo-atom probe tomography
E. V. Woods, A. Saksena, A. A. El-Zoka +7
Cryogenic atom probe tomography (cryo-APT) is being developed to enable nanoscale compositional analyses of frozen liquids. Yet, the availability of readily available substrates th…
Scalable Substrate Development for Aqueous Biological Samples for Atom Probe Tomography
Eric V. Woods, Se-Ho Kim, Ayman A. El-Zoka +2
Reliable and consistent preparation of atom probe tomography (APT) specimens from aqueous and hydrated biological specimens remains a significant challenge. One particularly diffic…
The fate of water in hydrogen-based iron oxide reduction
Ayman A. El-Zoka, Leigh T. Stephenson, Se-Ho Kim +2
Gas-solid reactions are cornerstones of many catalytic and redox processes that will underpin the energy and sustainability transition. The specific case of hydrogen-based iron oxi…
Revisiting in-depth chemical analysis for alkali ions-exchanged glass
Se-Ho Kim, Leigh T. Stephenson, Torsten Schwarza +1
The upcoming flexible ultra-thin glass for foldable displays has attracted widespread attention as an alternative to rigid electronic smartphones. However, the detailed composition…
Atom probe analysis of battery materials: challenges and ways forward
Se-Ho Kim, Stoichko Antonov, Xuyang Zhou +6
The worldwide developments of electric vehicles, as well as large-scale or grid-scale energy storage to compensate the intermittent nature of renewable energy generation has genera…
Laser-equipped gas reaction chamber for probing environmentally sensitive materials at near atomic scale
Heena Khanchandani, Ayman A. El-Zoka, Se-Ho Kim +6
Numerous metallurgical and materials science applications depend on quantitative atomic-scale characterizations of environmentally-sensitive materials and their transient states. S…
Understanding alkali contamination in colloidal nanomaterials to unlock grain boundary impurity engineering
Se-Ho Kim, Su-Hyun Yoo, Poulami Chakraborty +10
Metal nano-aerogels combine a large surface area, a high structural stability, and a high catalytic activity towards a variety of chemical reactions. The performance of such nanost…
Phase Separation and Anomalous Volume Expansion in Frozen Microscale Eutectic Indium-Gallium upon Remelting
Se-Ho Kim, Leigh T. Stephenson, Alisson K. da Silva +2
The eutectic Ga-In (EGaIn) alloy has low vapor pressure, low toxicity, high thermal and electrical conductivities, and thus has shown a great potential for smart material applicati…
Three-dimensional atomically-resolved analytical imaging with a field ion microscope
Shyam Katnagallu, Felipe Felipe F. Morgado, Isabelle Mouton +2
Atom probe tomography (APT) helps elucidate the link between the nanoscale chemical variations and physical properties, but it has limited structural resolution. Field ion microsco…
Reflections on the spatial performance of atom probe tomography in the analysis of atomic neighbourhoods
Baptiste Gault, Benjamin Klaes, Felipe F. Morgado +5
Atom probe tomography is often introduced as providing "atomic-scale" mapping of the composition of materials and as such is often exploited to analyse atomic neighbourhoods within…
Revealing atomic-scale vacancy-solute interaction in nickel
Felipe F. Morgado, Shyam Katnagallu, Christoph Freysoldt +7
Imaging individual vacancies in solids and revealing their interactions with solute atoms remains one of the frontiers in microscopy and microanalysis. Here we study a creep-deform…
Convolutional neural network-assisted recognition of nanoscale L12 ordered structures in face-centred cubic alloys
Yue Li, Xuyang Zhou, Timoteo Colnaghi +6
Nanoscale L12-type ordered structures are widely used in face-centred cubic (FCC) alloys to exploit their hardening capacity and thereby improve mechanical properties. These fine-s…
Influence of microstructure and atomic-scale chemistry on iron ore reduction with hydrogen at 700°C
Se-Ho Kim, Xue Zhang, Kevin Schweinar +10
With 1.85 billion tons produced per year, steel is the most important material class in terms of volume and environmental impact. While steel is a sustainability enabler, for insta…
Atomic scale mapping of impurities in partially reduced hollow TiO2 nanowires
Joohyun Lim, Se-Ho Kim, Raquel Aymerich Armengol +5
The incorporation of impurities during the chemical synthesis of nanomaterials is usually uncontrolled and rarely reported because of the formidable challenge that constitutes meas…
Direct imaging of dopant and impurity distributions in 2D MoS
Se-Ho Kim, Joohyun Lim, Rajib Sahu +4
Molybdenum disulfide (MoS) nanosheet is a two-dimensional material with high electron mobility and with high potential for applications in catalysis and electronics. We synthes…
Magneto-electric Tuning of Pinning-Type Permanent Magnets through Atomic-Scale Engineering of Grain Boundaries
Xinglong Ye, Fengkai Yan, Lukas Schaefer +11
Pinning-type magnets maintaining high coercivity, i.e. the ability to sustain magnetization, at high temperature are at the core of thriving clean-energy technologies. Among these,…
Status and direction of atom probe analysis of frozen liquids
Patrick Stender, Baptiste Gault, Tim M. Schwarz +8
Imaging of liquids and cryogenic biological materials by electron microscopy has been recently enabled by innovative approaches for specimen preparation and the fast development of…
Hydride growth mechanism in Zircaloy-4: investigation of the partitioning of alloying elements
Isabelle Mouton, Yanhong Chang, Poulami Chakraborty +4
The long-term safety of water-based nuclear reactors relies in part on the reliability of zirconium-based nuclear fuel. Yet the progressive ingress of hydrogen during service makes…
Solute hydrogen and deuterium observed at the near atomic scale in high-strength steel
Andrew J. Breen, Leigh T. Stephenson, Binhan Sun +5
Observing solute hydrogen (H) in matter is a formidable challenge, yet, enabling quantitative imaging of H at the atomic-scale is critical to understand its deleterious influence o…
Enabling near-atomic-scale analysis of frozen water
Ayman A. El-Zoka, Se-Ho Kim, Sylvain Deville +3
Transmission electron microscopy has undergone a revolution in recent years with the possibility to perform routine cryo-imaging of biological materials and (bio)chemical systems,…
Imaging individual solute atoms at crystalline imperfections in metals
Shyam Katnagallu, Leigh T. Stephenson, Isabelle Mouton +11
Directly imaging all atoms constituting a material and, maybe more importantly, crystalline defects that dictate materials' properties, remains a formidable challenge. Here, we pro…
Atomic-scale investigation of hydrogen distribution in a Ti-Mo alloy
Fengkai Yan, Isabelle Mouton, Leigh T. Stephenson +5
Ingress of hydrogen is often linked to catastrophic failure of Ti-alloys. Here, we quantify the hydrogen distribution in fully \b{eta} and α+\b{eta} Ti-Mo alloys by using atom prob…
Quantification challenges for atom probe tomography of hydrogen and deuterium in Zircaloy-4
Isabelle Mouton, Andrew J. Breen, Siyang Wang +8
Analysis and understanding of the role of hydrogen in metals is a significant challenge for the future of materials science, and this is a clear objective of recent work in the ato…