A5076605600- Diamond and Carbon-based Materials Research
- Metal and Thin Film Mechanics
- Force Microscopy Techniques and Applications
- Carbon Nanotubes in Composites
- Semiconductor materials and devices
- Chalcogenide Semiconductor Thin Films
- Phase-change materials and chalcogenides
- High-pressure geophysics and materials
- Ion-surface interactions and analysis
- Lubricants and Their Additives
- Mechanical and Optical Resonators
- Analytical Chemistry and Sensors
- Advanced materials and composites
- Advanced Surface Polishing Techniques
- Gas Sensing Nanomaterials and Sensors
- Laser-induced spectroscopy and plasma
- Laser-Ablation Synthesis of Nanoparticles
- Catalytic Processes in Materials Science
- Acoustic Wave Resonator Technologies
- Advanced Fiber Laser Technologies
- Nonlinear Optical Materials Studies
- Zeolite Catalysis and Synthesis
- Electronic and Structural Properties of Oxides
- Electron and X-Ray Spectroscopy Techniques
- Integrated Circuits and Semiconductor Failure Analysis
University of Kassel
2016-2025
Taras Shevchenko National University of Kyiv
2020
Czech Academy of Sciences, Institute of Geology
2020
Bulgarian Academy of Sciences
1997-2006
National Institute for Materials Science
1998
Technical University of Sofia
1991-1994
Sofia University "St. Kliment Ohridski"
1993-1994
Coal fly ash zeolites (CFAZs) with increased iron oxide content were prepared by double-stage alkaline conversion of high-iron lignite coal ash. Catalysts modified applying radiofrequency plasma treatment trifluoromethane (RF CHF3) to increase their surface activity. Textural, compositional, and structural characterization the parent plasma-modified performed N2-physisorption, X-ray powder diffraction (XRD), photoelectron spectroscopy (XPS) Fourier-transform infrared (FT-IR) spectroscopy....
Abstract Nanocrystalline diamond/amorphous carbon (NCD/a‐C) composite films have been deposited by microwave chemical vapour deposition from methane‐rich CH 4 /N 2 mixtures and characterized carefully a variety of methods with respect to morphology structure, composition, crystallinity, bonding environment. The consist diamond nanocrystals 3–5 nm diameter, which are embedded in an amorphous matrix 1–1.5 width. is mixture sp (20–30%) 3 bonded contains about 20% hydrogen, mostly atoms. New...
Group-IV color centers in diamond are promising candidates for quantum networks due to their dominant zero-phonon line and symmetry-protected optical transitions that connect coherent spin levels. The negatively charged tin-vacancy (SnV) center possesses long electron lifetimes its large spin-orbit splitting. However, the magnetic dipole required microwave control suppressed, strain is necessary enable these transitions. Recent work has shown of strained emitters using lines suffer from...
Group IV color centers in diamond are among the most promising optically active electron-spin systems with strong optical transitions and long spin coherences. The orbital ground-state splitting of center is particularly important to suppress interaction coherence-limiting phonons. A higher improves spin-coherence properties sets upper limit for operating temperature. Negatively charged silicon-vacancy have an ordinary from spin-orbit coupling only <a:math...
Fly ash (FA) from lignite coal combusted in different Thermal Power Plants (TPPs) was used for the synthesis of zeolites (FAZs) Na-X type by alkaline activation via three laboratory procedures. FAZs were characterized with respect to their morphology, phase composition and surface properties, which predetermine suitability applications as catalysts adsorbents. subsequently modified metal oxides (CuO) improve catalytic properties. The activity non-modified CuO-modified total oxidation...
Zeolites with their unique properties find applications in various fields, including medicine, agronomy, ecology, production of detergents and drying agents, a number industrial processes. Among zeolites, mordenite is particularly widespread because its high silica/alumina ratio, which allows it to resist exposure temperatures acidic gases liquids. Mordenite commercially available as natural mineral synthesized material. This zeolite mostly used synthetic form an acid catalyst the...
Nitrogen-vacancy (NV) color centers in diamond are excellent quantum sensors possessing high sensitivity and nano-scale spatial resolution. Their integration photonic structures is often desired, since it leads to an increased photon emission also allows the realization of solid-state technology architectures. Here, we report fabrication nano-pillars with diameters up 1000 nm by electron beam lithography inductively coupled plasma reactive ion etching nitrogen-rich diamonds (type Ib) [100]...
We introduce and demonstrate a new approach for nitrogen-vacancy (NV) patterning in diamond, achieving deterministic, nanometer-thin, dense delta-doped layer of negatively charged NV centers diamond. employed pure nitridation stage using microwave plasma subsequent situ diamond overgrowth. present the highest reported nitrogen concentration (1.8 × 1020 cm-3) while maintaining pristine crystal quality. This result combined with large optically detected magnetic resonance contrast can pave way...
Efficient optical interfacing of spin-bearing quantum emitters is a crucial ingredient for networks. A promising route therefore to incorporate host materials as minimally processed membranes into open-access microcavities: it enables significant emission enhancement and efficient photon collection, minimizes deteriorating influence on the emitter, allows full spatial spectral tunability. Here, we study properties high-finesse fiber Fabry-P\'erot microcavity with integrated single-crystal...
Electronic noses based on polymer-like carbon nitride (CNx) are investigated by these authors. The gas-sensing properties of CNx examined, focusing the detection humidity and ammonia. Two basic types gas sensor—capacitance microelectromechanical (see Figure)—are discussed. It is found that sensors highly sensitive, stable, have short response recovery times.
Abstract The incorporation of hydrogen within ultrananocrystalline diamond/amorphous carbon composite films has been investigated by nuclear reaction analysis (NRA) and Fourier transform infrared spectroscopy (FTIR). film bulk contains ca. 7.5–8% H (for a deposition temperature 600 °C), while the concentration in surface region is considerably higher. FTIR measurements show that hydrogen‐rich formed right at beginning process grows outward as thickness increases. It can thus be concluded...