A5077439351- Advanced Materials Characterization Techniques
- Diamond and Carbon-based Materials Research
- Microstructure and Mechanical Properties of Steels
- High Temperature Alloys and Creep
- Hydrogen embrittlement and corrosion behaviors in metals
- Ion-surface interactions and analysis
- Force Microscopy Techniques and Applications
- Laser-induced spectroscopy and plasma
- Microstructure and mechanical properties
- Metal Alloys Wear and Properties
- Metal and Thin Film Mechanics
- Electronic and Structural Properties of Oxides
- Advanced materials and composites
- nanoparticles nucleation surface interactions
- Fusion materials and technologies
- Electron and X-Ray Spectroscopy Techniques
- Intermetallics and Advanced Alloy Properties
- Aluminum Alloy Microstructure Properties
- High Entropy Alloys Studies
- Nanowire Synthesis and Applications
- Titanium Alloys Microstructure and Properties
- Planetary Science and Exploration
- Surface and Thin Film Phenomena
- Astro and Planetary Science
- Metallic Glasses and Amorphous Alloys
Northwestern University
2015-2024
Materials Science & Engineering
2013
Japan External Trade Organization
2008
Murphy Oil Corporation (United States)
2008
University of Göttingen
1992-2000
Helmut Schmidt University
1995
Abstract The three-dimensional (3D) atom-probe technique produces a reconstruction of the elemental chemical identities and positions atoms field evaporated from sharply pointed metal specimen, with local radius curvature less than 50 nm. number collected can be on order one million, representing an analysis volume approximately 20 nm × 200 (80,000 3 ). This large amount data allows for identification microstructural features in sample, such as grain or heterophase boundaries, if feature...
Microstructure, phase composition and mechanical properties of a refractory high entropy superalloy, AlMo0.5NbTa0.5TiZr, are reported in this work. The alloy consists nano-scale mixture two phases produced by the decomposition from temperature body-centered cubic (BCC) phase. first is present form cuboidal-shaped nano-precipitates aligned rows along <100>-type directions, has disordered BCC crystal structure with lattice parameter a1 = 326.9 ± 0.5 pm rich Mo, Nb Ta. second channels...
Graphene-enabled Ni/Ni 3 C composites with brick-and-mortar structure exhibited high strength and toughness.
Three-dimensional (3D) mesostructured semiconductors show promising properties and applications; however, to date, few methods exist synthesize or fabricate such materials. Metal can diffuse along semiconductor surfaces, even trace amounts change the surface behavior. We exploited phenomena for 3D mesoscale lithography, by showing one example where iterated deposition-diffusion-incorporation of gold over silicon nanowires forms etchant-resistant patterns. This process is facet-selective,...
The heterophase interfaces between the CdS buffer layer and Cu2ZnSnS4 (CZTS) absorption layers are one of main factors affecting photovoltaic performance CZTS cells. We have studied compositional distributions at in cells using three-dimensional atom-probe tomography. results demonstrate: (a) diffusion Cd into layer; (b) segregation Zn CdS/CZTS interface; (c) a change oxygen hydrogen concentrations depending on heat treatment. Annealing 573 K after deposition improves properties probably...
Characterization of atomic composition and spatially resolved dopant distribution in wide band gap semiconducting nanowires is critical for their applications next-generation nanoelectronic optoelectronic devices. We have applied laser-assisted atom probe tomography to measure the undoped GaN Mg-doped nanowires. Stoichiometric evaporation individual was achieved, optimal experimental conditions characterize concentration spatial Mg:GaN nanowire samples were established. Extremely mild...
Abstract Atom‐probe tomography ( APT ) is currently the only analytical technique that, due to its spatial resolution and detection efficiency, has potential measure carbon isotope ratios of individual nanodiamonds. We describe three different sample preparation protocols that we developed for analysis meteoritic nanodiamonds at sub‐nm present peak synthetic The results demonstrate an instrumental bias associated with needs be quantified corrected obtain accurate ratios. After this...
Laser-assisted synthesis yields silicon carbide–elastomer composite for bioelectric modulation of cells and tissues.