A5083353055- Ion-surface interactions and analysis
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Physics and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- GaN-based semiconductor devices and materials
- Electron and X-Ray Spectroscopy Techniques
- Carbon Nanotubes in Composites
- Semiconductor materials and devices
- Geological and Geochemical Analysis
- Polymer Nanocomposite Synthesis and Irradiation
- Diamond and Carbon-based Materials Research
- Semiconductor materials and interfaces
- Fusion materials and technologies
- Hydrogen Storage and Materials
- Advanced Materials Characterization Techniques
- Glass properties and applications
- Silicon Nanostructures and Photoluminescence
- Quantum Dots Synthesis And Properties
- High-pressure geophysics and materials
- Electronic and Structural Properties of Oxides
- Advanced Thermoelectric Materials and Devices
- Advanced Semiconductor Detectors and Materials
- Catalytic Processes in Materials Science
- Silicon and Solar Cell Technologies
- Particle accelerators and beam dynamics
University of Michigan–Ann Arbor
2016-2025
Draper Laboratory
2017-2019
Ann Arbor Center for Independent Living
2018
University of North Texas
2005-2009
Ben-Gurion University of the Negev
2009
Western Michigan University
2009
National University of General San Martín
1999-2003
University of Notre Dame
2002-2003
Comisión Nacional de Energía Atómica
1999-2002
Removing organics from hybrid nanostructures is a crucial step in many bottom-up materials fabrication approaches. It usually assumed that calcination an effective solution to this problem, especially for thin films. This assumption has led its application thousands of papers. We here show general incorrect by using relevant and highly controlled model system consisting films ligand-capped ZrO
We present a new set of reference material, the ND70-series, for in situ analysis volatile elements (H2O, CO2, S, Cl, F) silicate glass basaltic composition. Samples have been synthesised piston cylinders at pressures 1 to 1.5 GPa volatile-undersaturated conditions. They span concentrations from 0 6 wt.% H2O, 1.6 CO2 and Cl F. The samples characterised by Elastic Recoil Detection Analysis (ERDA) Nuclear Reaction (NRA) Elemental Analyser (EA) Fourier Transform Infrared Spectroscopy (FTIR) H2O...
Abstract We present a new approach to determine in situ CO 2 and H O concentrations apatite via attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). Absolute carbon hydrogen measurements by nuclear reaction analysis (NRA) elastic recoil detection (ERD) are used calibrate ATR-FTIR spectra of apatite. show that contents can be determined linear equations ( r > 0.99) using the integrated area IR absorption bands. The main benefits this analyses non-destructive...
We present X-ray absorption near-edge structure (XANES) spectroscopy of 11 silicate and aluminosilicate minerals two glasses at the SiK SiL2,3, OK edges. The similar nearestneighbor environments lead to spectral lineshapes each edge, but fine-structure differences allow individual groups structurally be distinguished. By combining spectra their first energy derivative from three edges, we show that every mineral studied is distinguishable with XANES. This background work, combined...
We present a new set of reference materials, the ND70‐series, for in situ measurement volatile elements (H 2 O, CO , S, Cl, F) silicate glass basaltic composition. The materials were synthesised piston cylinders at pressures 1 to 1.5 GPa under volatile‐undersaturated conditions. They span mass fractions from 0 6% m/m H 1.6% and 1% Cl F. characterised by elastic recoil detection analysis nuclear reaction elemental analyser Fourier transform infrared spectroscopy O secondary ion spectrometry...
Helium plasmas are attractive reagents for the removal of organics from hybrid materials because their minimal ablative power and relative inertness, compared to oxidizing feed gases such as O2 highly inert Ar. This work describes use dilute helium selectively remove organic ligands films colloidal nanoparticles (i.e., nanoparticle assemblies). We determine contribution etching different plasma species in a model system consisting ZrO2 capped with trioctylphosphine oxide. Unexpectedly, we...
GeSnC alloys offer a route to direct bandgap semiconductors for CMOS-compatible lasers, but the use of CBr4 as carbon source was shown reduce Sn incorporation by 83%–92%. We report on role thermally cracked H in increasing 6x–9.5x, restoring up 71% lost Sn, and attribute this increase removal Br from growth surface HBr prior formation volatile groups such SnBr4. Furthermore, flux is increased, Rutherford backscattering spectroscopy reveals monotonic both incorporation. X-ray diffraction...
In this work, we have calibrated the infrared (IR) method for determining OH concentrations in apatite with absolute obtained through elastic recoil detection (ERD) analysis. IR spectra were collected on oriented, single-crystal samples using polarized transmission spectroscopy. The weight percent H2O is 0.001199 ± 0.000029 (the error given at 1σ level hereafter) times A/d, where A linear absorbance peak height measured when light vector E parallel to c-axis of crystal, and d sample...
We present a measurement of the electron-capture branch $^{100}\mathrm{Tc}$. Our value, $B(\mathrm{EC})=(2.6\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, implies that $^{100}\mathrm{Mo}$ neutrino absorption cross section to ground state $^{100}\mathrm{Tc}$ is roughly 50% larger than previously thought. Disagreement between experimental value and QRPA calculations relevant double-$\ensuremath{\beta}$ decay matrix elements persists. find agreement...
We here describe a bottom-up approach to control the composition of solid/solid interfaces in nanostructured materials, and we test its effectiveness on tetragonal ZrO2, an inorganic phase great technological significance. Colloidal nanocrystals capped with trioctylphosphine oxide (TOPO) or oleic acid (OA) are deposited, organic fraction ligands is selectively etched O2 plasma. The resulting all-inorganic colloidal nanocrystal assemblies either nearly bare (for OA-capped nanocrystals)...
M-shell x-ray production cross sections for thorium and uranium have been determined protons of energies 0.4–4.0 MeV helium ions 0.4–6.0 MeV. The line total are compared to the predictions first Born approximation ECUSAR ionization theory using recently recommended atomic parameters. Both theories in good agreement with data He above 1 others on uranium, however, fall significantly under present measurements. Below MeV, decreasing energy these projectiles, increasingly overestimates our...
Abstract Ion implantation has a potential to modify the surface properties and produce thin conductive layers in insulating polymers. For this purpose, poly-allyl-diglycol-carbonate (CR-39) was implanted by 400 keV Au + ions with ion fluences ranging from 5 × 10 13 ions/cm 2 15 . The chemical, morphological optical of CR-39 were analyzed using Raman, Fourier transform infrared (FT-IR) spectroscopy, atomic force microscopy (AFM) UV-Vis spectroscopy. electrical conductivity samples determined...
The utility of ion beam analysis (IBA) techniques to quantitatively determine impurities in carbon nanotubes (CNTs) over a wide range atomic numbers is demonstrated. Such have not previously been used monitor and their effects this unique material. Despite the difficulty mounting samples (which generally are formed into powdery aggregate rather thin film), it shown that reliable accurate measurements impurity concentrations can be achieved. Particle-induced X-ray emission (PIXE) elastic...
This paper describes the creation of mesoporous inorganic films based on plasma processing ligand-capped nanocrystals. We use nanorods HfO2 as a model system and report an extensive characterization chemistry, structure, mechanical properties, reactivity to show that (i) aspect ratio regulates pore size volume in predictable manner yields increase porosity over spherical nanocrystals up 60%, (ii) modulus (>25 GPa) hardness (>1.1 are sufficient tolerate chemical–mechanical planarization,...