A5025376250- Metal and Thin Film Mechanics
- Ion-surface interactions and analysis
- Diamond and Carbon-based Materials Research
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Semiconductor materials and devices
- Planetary Science and Exploration
- Astro and Planetary Science
- Chalcogenide Semiconductor Thin Films
- GaN-based semiconductor devices and materials
- Phase-change materials and chalcogenides
- Integrated Circuits and Semiconductor Failure Analysis
- ZnO doping and properties
- Minerals Flotation and Separation Techniques
- Advanced Radiotherapy Techniques
- Silicon Nanostructures and Photoluminescence
- Advanced materials and composites
- Optical Coatings and Gratings
- Quantum Dots Synthesis And Properties
- Radiation Therapy and Dosimetry
- Advanced Surface Polishing Techniques
- Fusion materials and technologies
- Gas Sensing Nanomaterials and Sensors
- Metal Extraction and Bioleaching
University of Namur
2012-2024
Chemical Synthesis Lab
2021
University of Surrey
2012-2019
Guildford Hospital
2015-2016
The analysis of thin films is central importance for functional materials, including the very large and active field nanomaterials.
Crack-free, ligand-free, phase-pure nanostructured solids, using colloidal nanocrystals as precursors, are fabricated by a scalable and facile approach. Films produced this approach have conductivities comparable to those of bulk crystals over more than 1 cm (1.370 S cm-1 for PbS films).
Abstract Blistering is a phenomenon sometimes observed in sputtered-deposited thin films but seldom investigated detail. Here, we consider the case of titania-doped germania (TGO)/silica multilayers deposited by ion beam sputtering. TGO candidate as high refractive index material Bragg mirrors for next iteration gravitational waves detectors. It needs to be annealed at 600 ∘ C 100 h order reach desired relaxation state. However under some growth conditions, 52-layer TGO/silica stacks,...
There are few techniques capable of the non-destructive and model-free measurement at 1% absolute accuracy quantity material in thin films without use sample-matched standards. We demonstrate that Rutherford backscattering spectrometry can achieve this robustly, reliably conveniently. Using 1.5 MeV He+, a 150 keV ion implant into silicon with nominal fluence 5 × 1015 As cm−2 has been independently measured repeatedly over period 2 years mean total combined standard uncertainty 0.9 ± 0.3%...
The mechanical properties of colloidal nanocrystal superlattices can be tailored through exposure to low-pressure plasma. elastic modulus and hardness the ligand-free 3.7 nm ZrO2 superlattice are found similar bulk yttria-stabilized tetragonal polycrystals same relative density but without any doping. As a service our authors readers, this journal provides supporting information supplied by authors. Such materials peer reviewed may re-organized for online delivery, not copy-edited or...
In this work, we provide new insight on the influence of precursor (CH 4 vs. C 2 H ) mechanical properties a‐C:H coatings synthesized in a hybrid PECVD/PVD process. For given set plasma parameters, films CH /Ar gas mixture are found harder than ones prepared atmosphere despite their lower sp 3 density and similar hydrogen content. This unusual behavior is attributed to different molecular organization polymeric network constituting films. The latter explained considering chemical nature...
The fluorescence yield of the K- and L3-shell gallium was determined using radiometrically calibrated (reference-free) X-ray instrumentation at BESSY II synchrotron radiation facility.
1% Implanter Performance: RBS/measured fluence ratio for 16 implants (10<sup>15</sup> As cm<sup>−2</sup>) over 2 years.
Rutherford backscattering spectrometry (RBS) is a non-destructive thin film analytical technique of the highest absolute accuracy which, when used for elemental depth profiling, depends at first order on gain pulse-height system.
The study of the growth mechanisms amorphous hydrogenated carbon coatings (a-CHx) deposited by reactive pulsed magnetron discharge in Ar + C2H2, H2, and C2H2 H2 low-pressure atmospheres is presented this work. Hydrogen-containing species reactant gas affect microstructure surface properties a-CHx thin films. dynamic scaling theory has been used to relate main involved deposition process film means analysis roughness evolution. Anomalous effects have observed smooth coatings. Dynamic...
: Sputtering of silicon in a Helium magnetron discharge (MS) has been reported as bottom-up procedure to obtain He-charged films (i.e. He nanobubbles encapsulated matrix). The incorporation heavier noble gases is demonstrated this work with synergistic effect producing increased Ne and Ar incorporations when using He-Ne He-Ar gas mixtures the MS process. Microstructural chemical characterizations are by ion beam analysis (IBA) scanning transmission electron microscopies (SEM TEM). In...
Abstract Literature contains very few data about the potential biomedical application of amorphous hydrogenated carbon (a‐C:H) thin films deposited by reactive pulsed magnetron discharge even so it is one most scalable plasma deposition technique. In this article, we show that such a C 2 H produces high quality coating with good hemocompatibility and bioactive response: no effect on hemolysis hemostasis were observed, proliferation various cell types as endothelial, fibroblast,...
The growth of hydrogenated amorphous carbons (a-C:H) produced by continuous or pulsed discharges acetylene (C(2)H(2)) in an unbalanced magnetron setup was investigated. At 5 × 10(-3) Torr, only smooth films are obtained, whereas at 10(-1) Torr using a discharge some microtextured formed if the duty cycle is low. morphology these consists nanoparticles, filamentary particles, and particular agglomerates ("microflowers"). This paper presents study gas phase polymerization mass spectrometry,...
A novel approach for Ta and Nb extraction consisting of the pre-treatment a coltan-bearing ore with an ammonium bifluoride sub-molten salt subsequent acid leaching has been studied. The effects from granulometry, (ABF) to mass ratio, temperature duration fluorination on degree were examined. ABF ratio process found have most pronounced impact efficiency. following optimal conditions determined: granulometric fraction (−75 + 45 µm), ABF-ore (5/1), (200 °C) time (2.5 h). Maintaining these...