A5016958827- Diamond and Carbon-based Materials Research
- Metal and Thin Film Mechanics
- Ion-surface interactions and analysis
- Semiconductor materials and devices
- Electronic and Structural Properties of Oxides
- High-pressure geophysics and materials
- Hydrogen Storage and Materials
- MXene and MAX Phase Materials
- Lubricants and Their Additives
- Microstructure and mechanical properties
- Tribology and Wear Analysis
- Integrated Circuits and Semiconductor Failure Analysis
- 2D Materials and Applications
- Laser-induced spectroscopy and plasma
- Electron and X-Ray Spectroscopy Techniques
- Quantum, superfluid, helium dynamics
- Boron and Carbon Nanomaterials Research
- Adhesion, Friction, and Surface Interactions
- Advanced materials and composites
- Photocathodes and Microchannel Plates
- Advanced Fiber Laser Technologies
- Mechanical stress and fatigue analysis
- Silicone and Siloxane Chemistry
- Advanced Optical Sensing Technologies
- Catalysis and Hydrodesulfurization Studies
Holon Institute of Technology
2011-2024
Technion – Israel Institute of Technology
1995-2009
Soreq Nuclear Research Center
2006-2009
Israel Atomic Energy Commission
2009
Université Paris Cité
2005
Université Paris-Sud
2002-2003
Centre National de la Recherche Scientifique
2003
Plasma traetment induces chemical modiifcation in 1D WS 2 nanotubes, enhancing its electrocatalytic performances upon HER.
In the present work, we study sensitivity of near-edge x-ray absorption fine structure (NEXAFS) spectroscopy to ion induced defects in polycrystalline diamond films. The bombardment hydrogenated films is performed using 30 keV Xe+ ions at room temperature for doses ranging from 2×1013 ions/cm2, producing local point defects, 2×1015 which results almost complete amorphization surface. Auger electron measurements are not sensitive modifications by lowest implantation dose. Whereas partial...
The effect of moderate heating (200–300 °C) in vacuum on the photoemission from air-exposed hydrogen-terminated chemical vapor deposited diamond films was studied photon spectral range 140–210 nm (8.9–5.9 eV). A three- to fivefold enhancement observed, stable high and some purity gases, but unstable air. surfaces were also examined by x-ray induced photoelectron spectroscopy ultraviolet before after process upon exposure air oxygen. results provide good evidence that strong dipole...
Absolute quantum photoyield (QPY) measurements (140–210 nm) of chemical vapor deposited (CVD) diamond films are reported. The dependence the QPY on hydrogenation by exposure to a hydrogen microwave (MW) plasma and oxidation mixture acids or air under ambient conditions have been studied. Films MWCVD display higher than those grown hot filament (HF) CVD. values found depend state surface. Hydrogen-terminated exhibit above 12% at 140 nm, whereas even small amounts oxygen strongly degrade QPY....
In this work we report, a study of the mechanism ${\mathrm{H}}^{\mathrm{\ensuremath{-}}}$ electron stimulated desorption (ESD) from hydrogenated diamond films for incident energies in 2--45 eV range. Two types experiments were carried out order to assess nature ESD processes leading as function energy: (i) kinetic energy distribution (KED) and (ii) anions yield at fixed ion (FIE) measurements. The KED measurements show that electrons up \ensuremath{\sim}11 most probable ions monotonically...
In this work we correlate between O− electron stimulated desorption (ESD) from hydrogenated and bare polycrystalline diamond films exposed to thermally activated oxygen for incident energies in the 4–23 eV range vibrational energy losses. By utilizing previously established mechanism of low ESD surfaces high resolution loss spectroscopy carried out at an below threshold ion desorption, surface bonding configuration is discussed. Such analysis reveals formation C=O C–O–C bonds on surface, as...
In this work the effect of a low Earth orbit (LEO) space environment on fluorosilicone rubber polymers was studied. The emphasis made influence atomic oxygen (AO) and UV irradiation polymer chemical, morphological, mechanical properties. samples were exposed to LEO during Passive Optical Sample Assembly (POSA-II) experiment on-board MIR station in ground simulation radio frequency (RF) plasma Asher system. found have pronounced destructive rubber. Exposure for 18 months (AO fluence 2.1 1 10...
In the present work nucleation and growth of diamond by chemical vapor deposition (CVD) on highly oriented pyrolitic graphite (HOPG) glassy carbon (GC) substrates have been investigated. These represent generic forms well-characterized ordered disordered sp2 bonded materials. The nature precursor to CVD is assessed studying abraded with hard powders whose debris may act as initial centers, e.g., c-BN, onto which does not grow heteroepitaxially, alumina. Based our experimental results it...
In this paper we review a number of works on photon stimulated ion desorption (PSID) hydrogen from various diamond surfaces. particular, elaborate the bonding configuration adsorbed (deuterium) and its neighbouring atoms, thermal stability in surface sub-surface regions. Usage PSID as characterization method involves detailed description mechanism dynamics initiated by synchrotron generated beam. Several complimentary analytical techniques (near edge x-ray absorption fine structure...
In this work, the decay of secondary-electron emission (SEE) intensity and charging hydrogenated hydrogen-free diamond film surfaces subjected to incident electron irradiation at energies between 5 20 eV are investigated. Electron curves as a function energy were measured. For films, it was found that SEE decays in under continuous irradiation, albeit maintains nearly constant onset. The time measured for various energies. From these measurements, rate from surface calculated display broad...
Covers advancements in spacecraft and tactical strategic missile systems, including subsystem design application, mission analysis, materials structures, developments space sciences, processing manufacturing, operations, applications of technologies to other fields.
In the present work effect of incident laser power on Raman spectra diamond isolated particles and continuous films deposited silicon glassy carbon (GC) substrates by chemical vapor deposition method is investigated. It shown that line position measured for shifts to lower wave numbers as a function power. These were most drastic single GC examined using microprobe. this case peak displayed negative shift ∼18 cm−1 when output was increased from 1 15 mW. The beam diameter ∼2 μm particle 3–6...