A5083907530- Diamond and Carbon-based Materials Research
- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- Carbon Nanotubes in Composites
- Lubricants and Their Additives
- Advanced materials and composites
- Force Microscopy Techniques and Applications
- High-pressure geophysics and materials
- Plasma Diagnostics and Applications
- Graphene research and applications
- Bone Tissue Engineering Materials
- Surface and Thin Film Phenomena
- Dental materials and restorations
- Advanced Surface Polishing Techniques
- Tribology and Wear Analysis
- Orthopaedic implants and arthroplasty
- Ion-surface interactions and analysis
- Copper Interconnects and Reliability
- Thermodynamic and Structural Properties of Metals and Alloys
- Tunneling and Rock Mechanics
- Physics and Engineering Research Articles
- Electron and X-Ray Spectroscopy Techniques
- Corrosion Behavior and Inhibition
- Atomic and Subatomic Physics Research
- Electrostatics and Colloid Interactions
University of Duisburg-Essen
2009-2019
Ruhr University Bochum
2007
Essen University Hospital
1996-2002
Deutsches Forschungsnetz
1983-1987
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
1986
University of Göttingen
1971-1981
Abstract Micro plasmas operated at ambient pressure with dimensions of the confining geometry in order a few ten micrometers to millimeter are actually focus interest due broad regime applicability they offer and similarly range open physical questions. Here we present optical measurements within discharge core effluent region an especially developed micro jet. To get understanding complex system this it is important analyse transport phenomena energy particles both parts by various highly...
Silicate-containing hydroxyapatite-based coatings with different structure and calcium/phosphate ratios were prepared by radio-frequency magnetron sputtering on silicon titanium substrates, respectively. Scanning electron microscopy, X-ray diffraction IR spectroscopy used to investigate the effect of substrate bias properties silicate-containing coatings. The deposition rate, composition, microstructure deposited all controlled changing voltage from grounded (0 V) −50 −100 V....
Abstract A coating on the basis of silver‐containing hydroxyapatite (silver‐hydroxyapatite) was deposited by radio frequency (RF) magnetron sputtering. X‐ray diffractometry, scanning electron microscopy, energy‐dispersive spectroscopy, and ellipsometry were used to analyse change in structure stoichiometry coatings upon negative electrical bias (–50 V –100 V) substrate. The chemical composition sputter‐deposited identical target. However, an increase substrate led a decrease thickness. In...
In this work, the deposition of carbon nanowalls (CNWs) by inductively coupled plasma enhanced chemical vapor (ICP-PECVD) is investigated. The CNWs are electrically conducting and show a large specific surface area, which key characteristic to make them interesting for sensors, catalytic applications or energy-storage systems. It was recently discovered that CNW films can be deposited use single-source metal-organic precursor aluminium acetylacetonate. This relatively unknown in combination...
Thin films of BaTiO3 were prepared by radio-frequency magnetron sputtering at substrate temperatures from 450 to 750 °C and analysed x-ray diffraction, optical transmittance Raman spectroscopy. The packing density the relative crystalline increases 0.75 about 1 °C. At a temperature °C, film is nano-crystalline (5 20 nm) with big lattice expansion, large band gap pronounced hexagonal lines. This homogeneous in thickness direction. Films higher exhibit perovskite peaks spectrum an 3.38 eV. 600...
The simultaneous growth of both nanodiamonds and graphene on copper samples is described for the first time. A PE-CVD process used to synthesize layers nanodiamond clusters from a hydrogen/methane gas mixture as it typically done successfully in thermal CVD processes synthesis. However, standard not without problems since deposition affected by evaporation notable amount caused slow temperature increase typical resulting long In sharp contrast, synthesis can circumvent this problem...
Applications of nitrogen-vacancy (NV) centers in diamond quantum technology have attracted considerable attention recent years. Deterministic generation ensembles NV can advance the research on sensing, many-body systems, multipartite entanglement, and so on. Here we report complete process controlled as well their characterization: growing films through chemical vapor deposition (CVD), ion implantation, spectroscopic characterization defect using a confocal microscope. A microwave-assisted...
We have investigated single layer, bilayer and few-layer graphene exfoliated on SiO2 crystal surfaces of SrTiO3, Al2O3 TiO2 using Raman spectroscopy. The typical 'fingerprint' 2D peak turns out to be indicative the number layers independent substrate material. morphological quality is as good substrates for all materials. find evidence substrate-induced changes due doping. With most substrates, hole doping observed, but with SrTiO3 we identified a dielectric which electron accumulation in...
In this study, we tried to deposit graphene films on copper substrates using hot filament chemical vapor deposition. The quality and the electronic structural properties of deposited carbon were investigated by Raman spectroscopy. Three samples produced designated as A, B C according preparation conditions. Experiments conducted at temperatures 800 1000 °C, a gas pressure 500 torr exposure times 1, 5 30 min. intensity disorder-induced D peak is observed relative that G peak. shape 2D gives...