Publications by authors named "Roman Khmelnitskiy"
We report the growth of Ge-doped homoepitaxial diamond films by microwave plasma CVD in GeH-CH-H gas mixtures at moderate pressures (70-100 Torr). Optical emission spectroscopy was used to monitor Ge, H, and C species in the plasma at different process parameters, and trends for intensities of those radicals, gas temperature, and excitation temperature, with variations of GeH or CH precursor concentrations, were investigated. The film deposited on (111)-oriented single crystal diamond substrates in a high growth rate regime revealed a strong emission of a germanium-vacancy (GeV) color center with a zero-phonon line at ≈604 nm wavelength in photoluminescence (PL) spectra, confirming the successful doping.
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- The study investigates the antibacterial effects of silver (Ag) and copper (Cu) nanoparticles (NPs) against methicillin-resistant bacteria, comparing them to traditional metal salt solutions.
- NPs were created using nanosecond laser ablation and were characterized using various techniques like electron microscopy and spectroscopy to analyze their properties and effectiveness.
- The results highlighted that Ag and Cu NPs, along with metal salts, enhance bacterial membrane fluidity and cause cell damage through ion release and other mechanisms, leading to bacterial death, as validated by spectroscopic and microscopy techniques.