A5061241764- Electron and X-Ray Spectroscopy Techniques
- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- Ion-surface interactions and analysis
- Advanced Materials Characterization Techniques
- Advanced ceramic materials synthesis
- Intermetallics and Advanced Alloy Properties
- Anodic Oxide Films and Nanostructures
- Nuclear Physics and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Electron Microscopy Techniques and Applications
- Diamond and Carbon-based Materials Research
- Nuclear Materials and Properties
- High-Temperature Coating Behaviors
- Electronic and Structural Properties of Oxides
- Ferroelectric and Piezoelectric Materials
- Spectroscopy and Chemometric Analyses
- GaN-based semiconductor devices and materials
- X-ray Spectroscopy and Fluorescence Analysis
- Chalcogenide Semiconductor Thin Films
- Force Microscopy Techniques and Applications
- Advanced X-ray and CT Imaging
- Astro and Planetary Science
- Advancements in Battery Materials
- Advanced Memory and Neural Computing
Sandia National Laboratories
2016-2025
Sandia National Laboratories California
2014-2024
Center for Integrated Nanotechnologies
2021
Energy Storage Systems (United States)
2021
Michigan State University
2017
Northrop Grumman (United States)
2017
Bruker (United States)
2014
Cornell University
1990-2014
Micron (United States)
2014
Olympus (United States)
2014
High‐performance memristors based on AlN films have been demonstrated, which exhibit ultrafast ON/OFF switching times (≈85 ps for microdevices with waveguide) and relatively low current (≈15 μA 50 nm devices). Physical characterizations are carried out to understand the device mechanism, rationalize speed energy performance. The formation of an Al‐rich conduction channel through layer is revealed. motion positively charged nitrogen vacancies likely responsible observed switching.
Real-time measurements of stress evolution during the deposition Volmer–Weber thin films reveal a complex interplay between mechanisms for generation and relaxation. We observed generic from compressive to tensile, then back as film thickened, in amorphous polycrystalline Ge Si, well Ag, Al, Ti. Direct relaxation growth interrupts demonstrate that behavior occurs even absence When did occur, mechanism depended sensitively on whether was continuous or discontinuous, process conditions,...
Carbon nanotubes produced in arcs have been found to the form of multiwalled fullerenes, at least over short lengths. Sintering tubes each other is predominant source defects that limit utility these otherwise perfect fullerene structures. The use a water-cooled copper cathode minimized such defects, permitting longer than 40 micrometers be attached macroscopic electrodes and extracted from bulk deposit. A detailed mechanism features high electric field (and field-emission from) open...
Spectral imaging in the scanning electron microscope (SEM) equipped with an energy-dispersive X-ray (EDX) analyzer has potential to be a powerful tool for chemical phase identification, but large data sets have, past, proved too efficiently analyze. In present work, we describe application of new automated, unbiased, multivariate statistical analysis technique very spectral image sets. The method, based part on principal components analysis, returns physically accurate (all positive)...
Abstract Recent years have seen the introduction of many surface characterization instruments and other spectral imaging systems that are capable generating data in truly prodigious quantities. The challenge faced by analyst, then, is to extract essential chemical information from this overwhelming volume data. Multivariate statistical techniques such as principal component analysis (PCA) forms factor promise be among most important powerful tools for accomplishing task. In order benefit...
Lipid rafts isolated by detergent extraction and sucrose gradient fractionation from mast cells are enriched for the glycosylphosphatidylinositol-linked protein Thy-1, ganglioside GM1, palmitoylated LAT, cross-linked IgE receptors, FcepsilonRI. This study addresses relationship of data to organization raft markers in native membranes. Immunogold labeling electron microscopy shows there is little or no colocalization LAT with each other FcepsilonRI on membrane sheets prepared unstimulated...
Friction and wear are major concerns in the performance reliability of microelectromechanical systems (MEMS) devices employing sliding contacts. While many tribological coating materials available, most traditional surface processes unable to apply conformal coatings high aspect ratio (height/width) structures typical MEMS devices. We demonstrate that thin, conformal, wear-resistant can be applied Si surface-micromachined by atomic-layer deposition (ALD). For this demonstration, we...
Plasmonics is a rapidly growing field, yet imaging of the plasmonic modes in complex nanoscale architectures extremely challenging. Here we obtain spatial maps localized surface plasmon high-aspect-ratio silver nanorods using electron energy loss spectroscopy (EELS) and correlate to optical data classical electrodynamics calculations from exact same particles. EELS mapping thus demonstrated be an invaluable technique for elucidating overlapping modes.
We report on a new camera that is based pnCCD sensor for applications in scanning transmission electron microscopy. Emerging microscopy techniques demand improved detectors with regards to readout rate, sensitivity and radiation hardness, especially mode. The 2D imaging meets these requirements. Its intrinsic hardness permits direct detection of electrons. read out at rate 1,150 frames per second an image area 264 x pixel. In binning or windowing modes, the increased almost linearly, example...
Black TiO2 nanoparticles with a crystalline-core and amorphous-shell structure exhibit superior optoelectronic properties in comparison pristine TiO2. The fundamental mechanisms underlying these enhancements, however, remain unclear, largely due to the inherent complexities limitations of powder materials. Here, we fabricate homojunction films consisting an oxygen-deficient amorphous layer on top highly crystalline layer, simulate structural/functional configuration black nanoparticles....
Graphene–like carbon–Ni–α-MnO2 and –Cu–α-MnO2 blends can serve as effective catalysts for the oxygen reduction reaction with activities comparable to Pt/C.
By utilizing an equilibrium processing strategy that enables co-firing of oxides and base metals, a means to integrate the lithium-stable fast lithium-ion conductor lanthanum lithium tantalate directly with thin copper foil current collector appropriate for solid-state battery is presented. This resulting thin-film electrolyte possesses room temperature conductivity 1.5 × 10−5 S cm−1, which has potential increase power over state art.
The synthesis of Au–MoS2 nanocomposite thin films and the evolution their structures during film growth, in situ transmission electron microscopy (TEM) heating, sliding contact were investigated. TEM revealed that deposited at ambient (room) temperature (RT) consisted 2–4 nm size Au particles a matrix MoS2. With increasing growth temperatures, exhibited structural changes: nanoparticles coarsened by diffusion-driven Ostwald ripening to 5–10 MoS2 basal planes encapsulated thereby forming...
Multivalent rechargeable metal batteries offer a safer, more sustainable, and higher energy density alternative to lithium-ion batteries, though several challenges remain. Recent demonstrations of room-temperature reversible electrodeposition dissolution Ca indicate that it is possible stabilize metallic anodes with spontaneously formed solid electrolyte interphases (SEIs). However, further progress toward the goal an energy-efficient, long cycle-life anode requires correlating interphase...
Radiation-induced effects on the electrical characteristics of TaO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> memristive (or redox) memory are experimentally assessed. 10 keV x-ray irradiation is observed to cause switching memristors from high low resistance states, as well functional failure due cumulative dose. Gamma rays and 4.5 MeV energy protons not significant change in state or device function at levels up 2.5 Mrad(Si) 5...