A5102950573- Physics of Superconductivity and Magnetism
- Catalytic Processes in Materials Science
- Electronic and Structural Properties of Oxides
- Advanced ceramic materials synthesis
- X-ray Diffraction in Crystallography
- Catalysis and Oxidation Reactions
- Acoustic Wave Resonator Technologies
- Metal and Thin Film Mechanics
- Advancements in Solid Oxide Fuel Cells
- GaN-based semiconductor devices and materials
- Ferroelectric and Piezoelectric Materials
- ZnO doping and properties
- Semiconductor materials and devices
- Catalysis and Hydrodesulfurization Studies
- Fuel Cells and Related Materials
- Diamond and Carbon-based Materials Research
- Electrocatalysts for Energy Conversion
- Gas Sensing Nanomaterials and Sensors
- Nuclear materials and radiation effects
- High-pressure geophysics and materials
- Magnetic properties of thin films
- Nanowire Synthesis and Applications
- Advanced materials and composites
- Magnetic and transport properties of perovskites and related materials
- Ion-surface interactions and analysis
Washington State University
2016-2025
National Institutes of Health
2007-2012
University of Idaho
2002-2011
Southwest Research Institute
2009
Shell (United Kingdom)
2008
University of Alaska Fairbanks
2008
Motorola (United States)
2008
University of Maryland, College Park
2008
University of California, Santa Cruz
2008
National Heart Lung and Blood Institute
2007
Basics: X-Rays and Diffraction. Lattices Crystal Structures. Practical Aspects of X-Ray Experimental Modules: Structure Determination, I: Cubic II: Hexagonal Precise Lattice Parameter Measurements. Phase Diagram Determination. Detection Long-Range Ordering. Determination Crystallite Size Strain. Quantitative Analysis Powder Mixtures. Identification an Unknown Specimen: Appendices: Plane-Spacing Equations Unit Cell Volumes. Quadratic Forms Miller Indices for the System. Atomic Ionic...
Introduction.- Some History.- What You Already Know.- Bonds and Energy Bonds.- Models, Crystals Chemistry.- Binary Compounds.- Complex Crystal Glass Structures.- Equilibrium Phase Diagrams.- Furnaces.- Characterizing Structure, Defects Point Defects, Charge Diffusion.- Are Dislocations Unimportant?- Surfaces, Nanoparticles Foams.- Interfaces in Polycrystals.- Boundaries, Particles Pores.- Mechanical Testing.- Deforming: Plastic.- Fracturing: Brittleness.- Raw Materials.- Powders, Fibers,...
The synthesis and characterization of ultrafine CuInS2 nanoparticles are described. Ultraviolet irradiation was used to decompose a molecular single source precursor, yielding organic soluble approximately 2 nm sized with narrow size distribution. UV-vis absorption, 1H 31P{1H} NMR, fluorescence spectroscopies mass spectrometry were characterize decomposition the precursors nanoparticle formation. characterized by high-resolution transmission electron microscopy (HRTEM), scanning energy...
Amorphous silicon carbide nanosprings, as well biphase (crystalline core/amorphous sheath) helical nanowires, have been synthesized by plasma enhanced chemical vapor deposition. Both variants grow via the vapor−liquid−solid mechanism. The formation of amorphous nanosprings is explained in terms contact angle anisotropy model initially proposed to explain boron nanosprings. A modified model, where presence temperature gradients within catalyst are imposed, has nanowires. basis for this that...
The transition from linear to helical growth of amorphous boron carbide nanowires has been examined with high-resolution transmission electron microscopy. Based on the observed changes iron catalyst at point growth, a model solid developed based work adhesion metallic tip nanowire. This demonstrates that contact angle anisotropy catalyst/wire interface drives growth. is introduced when radius droplet (R) exceeds nanowire (ρ), and center mass metal displaced laterally central axis
Electrical properties of a chemical sensor constructed from mats GaN nanowires decorated with gold nanoparticles as function exposure to Ar, N2, and methane are presented. The Au nanoparticle exhibited chemically selective electrical responses. exhibits nominal response Ar slightly greater for N2. Upon the conductivity is suppressed by 50% relative vacuum. effect fully reversible independent history. We offer model which change in current caused depletion depth nanowires, being due an...
The morphology, composition, and crystallographic orientation of the substrate influence nucleation growth deposited thin films. A method for preparation controlled, characteristic surfaces is reported. are suitable heteroepitactic When used in formation electron-transparent foils, substrates can be to investigate very early stages film using transmission electron microscopy. involves cleaning subsequent annealing generate a surface consisting series steps. step terraces formed on...
Abstract A basic ionic liquid was selected to serve as both the solvent and base for Heck, “copper‐free” Sonogashira reactions, homocoupling reactions of terminal alkynes. The liquids with tertiary aliphatic amines are effective solvents these reactions. Under reflux conditions, eight equivalent Pd(OAc) 2 in THF or acetone produced palladium colloids diameters (2.6 ± 0.3) (3.7 0.5) nm, respectively. Preliminary results Knoevenagel condensations also reported.(© Wiley‐VCH Verlag GmbH &...
Nanosprings are a new form of nanowires that have potential applications in nanoelectronics, nanomechanics, and nanoelectromechanical systems. In this review we will examine the growth mechanism these novel nanostructures. The synthesis by vapour–liquid–solid mechanism, first proposed Wagner Ellis, be explored then extended to development model explain formation nanosprings.
Single-phase aluminum nitride thin films with preferred crystallographic orientations have been grown on single-crystal sapphire by pulsed-laser ablation. The orientation of the was found to be determined atmosphere and nitrogen pressure during deposition substrate temperature. were examined x-ray diffraction, scanning electron microscopy.
Exosomes play a significant role in cancer progression and are potentially useful biomarkers for noninvasive diagnostics therapeutic treatments. Although exosomes difficult to study because of their small, inconsistent sizes challenging purification processes, new micro- nanotechnologies have been recently developed that seek overcome these limitations. In this review, we examine compare isolation detection techniques various types extracellular vesicles (EVs) including exosomes, which <200...
Impurities play a major role in determining the optical and electrical properties of semiconductor nanoparticles. In this work, presence source CO2 impurities ZnO nanoparticles were studied by IR absorption spectroscopy. Isotopic substitution was used to verify vibrational frequency assignment. Isochronal annealing experiments performed study formation stability molecular impurities. Our results indicate that molecules are much more stable than adsorbed on bulk surfaces. By comparing our...
The neutral and charged species emitted by pulsed-laser irradiation of polytetrafluoroethylene (PTFE) at 248 nm in vacuum have been examined. In particular, the properties emission products produced typical fluence regimes used deposition PTFE thin films characterized. relative intensities major as well their dependence on laser are presented, a simple model is to fit observed dependence. Evidence that component, monomer (C2F4), formed from thermally activated unzipping reaction presented....
This paper presents studies of the optical properties MgxZn1−xO nanocrystals below and at phase transition range where solubility is limited. For Mg composition 0%–30%, samples were found to consist wurtzite structure exhibited band edge absorption as well photoluminescence (PL) blueshift ∼0.25 eV. The cold temperature PL ZnO exhibits A-exciton bound exciton with values similar that bulk reference sample. In addition, was be dominated by an emission, referred ε-PL, ∼3.32 eV ∼56 meV...
Mechanical elasticity of hexagonal wurtzite GaN nanowires with cross sections grown through a vapour-liquid-solid (VLS) method was investigated using three-point bending digital-pulsed force mode (DPFM) atomic microscope (AFM). In diameter range 57-135 nm, deflection and effective stiffness, or spring constant, profiles were recorded over the entire length end-supported compared to classic elastic beam models. Profiles reveal that behaviour smallest nanowire (57.0 nm in diameter) is as fixed...