A5101696372- Catalytic Processes in Materials Science
- Electrocatalysts for Energy Conversion
- Catalysis and Oxidation Reactions
- Nanowire Synthesis and Applications
- Catalysis and Hydrodesulfurization Studies
- Electronic and Structural Properties of Oxides
- Electron and X-Ray Spectroscopy Techniques
- Advanced Electron Microscopy Techniques and Applications
- Semiconductor materials and devices
- Transition Metal Oxide Nanomaterials
- Ion-surface interactions and analysis
- Ga2O3 and related materials
- Advancements in Battery Materials
- Nanomaterials for catalytic reactions
- TiO2 Photocatalysis and Solar Cells
- Metal and Thin Film Mechanics
- Anodic Oxide Films and Nanostructures
- Advanced Photocatalysis Techniques
- Thermography and Photoacoustic Techniques
- thermodynamics and calorimetric analyses
- Iron oxide chemistry and applications
- Shape Memory Alloy Transformations
- Intermetallics and Advanced Alloy Properties
- Nanoparticles: synthesis and applications
- Nanomaterials and Printing Technologies
BASF (United States)
2019-2023
University of Illinois Chicago
2010-2016
The University of Tokyo
2010
Michigan State University
2007
Constructing single atom catalysts with fine-tuned coordination environments can be a promising strategy to achieve satisfactory catalytic performance. Herein, via simple calcination temperature-control strategy, CeO
Engineering surface defects on metal oxide supports could help promote the dispersion of active sites and catalytic performance supported catalysts. Herein, a strategy ZrO2 doping was proposed to create rich CeO2 (CZO) and, with these defects, improve Pt enhance its affinity as single CZO support (Pt/CZO). The strongly anchored were initially not efficient for oxidation CO/C3H6. However, after simple activation by H2 reduction, over Pt/CZO catalyst significantly boosted better than Pt/CeO2....
There has been long-standing interest in tuning the metal-insulator phase transition vanadium dioxide (VO2) via addition of chemical dopants. However, underlying mechanisms by which doping elements regulate VO2 are poorly understood. Taking advantage aberration-corrected scanning transmission electron microscopy, we reveal atomistic origins tungsten (W) dopants influence single crystalline WxV1-xO2 nanowires. Our atomically resolved strain maps clearly show localized normal to (122̅) lattice...
Compared with Pt/Al2O3, sintering-resistant Pt nanoparticle catalysts promoted by ZnO significantly improved the reactivity and selectivity toward hydrogen formation in aqueous phase reforming (APR) of 1-propanol. The performance was found to benefit from both electronic geometric effects thin films. In situ small-angle X-ray scattering scanning transmission electron microscopy showed that ZnO-promoted possessed promising thermal stability under APR reaction conditions. absorption...
Phase transformation─a universal phenomenon in materials─plays a key role determining their properties. Resolving complex phase domains materials is critical to fostering new fundamental understanding that facilitates material development. So far, although conventional classification strategies such as order-parameter methods have been developed distinguish remarkably disparate phases, highly accurate and efficient segmentation for systems composed of multiphases remains unavailable. Here,...
We have developed colloidal synthesis methods to create nanoparticles (NPs) of tantalum nitride. The particle sizes and crystallinity can be controlled through the use different organic solvents reaction times; we demonstrate here NPs ranging in size from 2 23 nm. While electron microscopy selected area diffraction nitride (which may partially oxidized), results X-ray photoelectron spectroscopy reveal that majority our sample is present as an unidentified molecular-scale oxide species.
The synthesis of highly dispersed palladium nanoparticles on TiO2 surfaces from hexafluoroacetylacetonate (Pd(hfac)2) was investigated using in situ infrared (IR) spectroscopy, X-ray absorption spectroscopy (XAS), and pair distribution function (PDF) measurements under practical atomic layer deposition conditions. Residual surface chlorine found to directly participate the transformation organometallic compounds nanoparticles. Deligation Pd(hfac)2, evolution species, nucleation Pd were...
Abstract A newly designed, 100 mm 2 , silicon drift detector has been installed on an aberration-corrected scanning transmission electron microscope equipped with ultra-high resolution pole piece, without requiring column modifications. With its unique, windowless design, the detector’s active region is in close proximity to sample, resulting a dramatic increase count rate, while demonstrating increased sensitivity low energy X-rays and muted tilt dependence. Numerous examples of X-ray...
Abstract: Infection-related complications have been a critical issue for the application of titanium orthopedic implants. The use Ag nanoparticles offers potential approach to incorporate antimicrobial properties into In this work, novel and simple method was developed synthesis (II) oxide deposited TiO 2 nanotubes (TiNTs) using electrochemical anodization followed by electroplating processes in same electrolyte. quantities AgO TiNT were controlled selecting different times voltages. It...
Tantalum oxynitride (TaON) is a visible photocatalyst (λ < 520 nm) that has been investigated for green energy applications, specifically, the solar production of hydrogen gas. Metal oxynitrides are often generated by ammonolysis metal oxides at very high temperatures. We have an alternative synthetic procedure to produce gram-scale quantities photocatalytically active TaOxNy materials using room-temperature sol–gel chemistry. X-ray photoelectron spectroscopy (XPS) results confirm nitrogen...
Abstract ZnO nanowire nucleation mechanism and initial stages of growth using the carbothermal reduction technique are studied confirming involvement catalyst at tip in process. Role Au is further confirmed when tapering observed nanowires can be explained by change shape causing a variation contact area liquid–solid interface nanowires. The rate decrease diameter with length on average found to 0.36 nm/s this larger near base. Variation basis which Zn atoms supplied as well droplet...
We report the synthesis of LiFePO4 (LFP) battery materials where during iron has been substituted by up to 10 mol % with titanium. Analysis Ti-substituted revealed that at substitution levels investigated, Ti did not form a solid solution LFP, but rather minority phases containing phosphates were formed and segregated nanoscopic scale. The amorphous or well-crystallized accepted Li on first discharge in lithium half cell, state NMR spectra consistent one constituents being LiTi2(PO4)3. had...
(Abstract) We lay out the metallurgical basis for a new and robust method joining NiTi shape-memory superelastic alloys. It is based on use of pure niobium as melting-point depressant that can induce contact melting with at tractable temperatures. A strong, ductile, corrosion-resistant, biocompatible braze joint achieved without fluxes allows processing in normal industrial vacuum conditions. The discovery may have far-reaching implications complex aerospace structures, will allow expanded...
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Al 2 O 3 -supported Pt/Pd bimetallic catalysts were studied using in situ atmospheric pressure and ex transmission electron microscopy.
This paper presents material properties of self-assembled Cu nanowires that were fabricated in the vacuum e-beam evaporation method. Diffraction patterns obtained from Transmission Electron Microscopy (TEM) indicate have two slightly different properties: single crystalline structures and polycrystalline with low angle grain boundary. Focused ion beam (FIB) was also used to observe cross sectional shape.
This paper presents a method of fabricating self assembled bimetallic Ag and Cu-Si nanowires on Si(001) with electron beam (e-beam) evaporation in ultra high vacuum (UHV) environment. We fabricated three types two variations Ag/Cu-Si that were modulated longitudinal segment wise parallel type nanowire. Two fabrication performed: (1) nanowire both directions (2) the following Ag/Cu-Si/Ag Cu-Si/Ag/Cu-Si configurations. In situ scanning microscopy (SEM) images are shown. X-ray energy dispersive...
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Metal-Insulator Transition (MIT) in VO 2 has attracted attention of many theorists and experimentalists for more than fifty years since the discovery phenomena by Morin [1].The distinctive aspects this are structural phase transition, sharp resistivity optical transparency changes several order magnitudes at ~ 340 K [2].These properties have inspired applications such as thermo/electrochromics, Mott transistors, memristors, thermal actuators, gas sensors, strain sensors temperature...