999C1a:KAN400100701 - Výsledky hledání - Digitální repozitář

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	Optically and electronically active diamond-silicon photonic structures: state and outlooks Ondič, Lukáš ; Dohnalová, Kateřina ; Kůsová, Kateřina ; Cibulka, Ondřej ; Ledinský, Martin ; Babchenko, Oleg ; Kromka, Alexander ; Rezek, Bohuslav ; Pelant, Ivan We have prepared the photonic crystal at the top of the nanocrystalline diamond layer. We have obtained the effective extraction of diamond intrinsic photoluminescence via leaky modes. We have shown the simulation of optical gain enhancement in the photonic crystal. Úplný záznam
	Role of microscopic morphology in electrostatic charging of nanocrystalline diamond Verveniotis, Elisseos ; Kromka, Alexander ; Rezek, Bohuslav Self assembly of nanoparticles on NCD possible. Films macroscopically homogenous (SEM, Raman), however microsopic structural variations (SEM cross sections) do exist. Detailed KFM and CS-AFM measurements indicate that charge is mostly confined in the inter-grain space. Úplný záznam
	Synthesis, structure, and opto-electronic properties of organic dies on diamond Rezek, Bohuslav ; Čermák, Jan ; Ukraintsev, Egor ; Hubík, Pavel ; Mareš, Jiří J. ; Ledinský, Martin ; Fejfar, Antonín ; Kočka, Jan ; Kromka, Alexander We prepare a thin-film heterojunction of polypyrrole (Ppy) on hydrogen-terminated diamond by electro-polymerization from solution. We combine advanced scanning techniques (AFM, KFM, micro-Raman) to characterize microscopic structural, chemical, and opto-electronic properties of such system. Úplný záznam
	Diamond chemical vapor deposition Kromka, Alexander Present paper reviews growth of diamond thin films by various chemical vapor deposition processes. Basic characteristics and common features of processes are pointed out with a respect to quality of grown films and standard process parameters. Novel and non-standard diamond syntheses techniques are briefly discussed. Úplný záznam
	Influence of methane concentration on diamond film morphology and growth rate Ižák, Tibor ; Babchenko, Oleg ; Kromka, Alexander ; Potměšil, Jiří ; Hruška, Karel In this study we investigated the influence of methane concentration on the diamond film growth. The experiments were carried out in focused microwave chemical vapour deposition system. The methane concentration was varied from 0.5% to 10 % of CH4 in H2 atmosphere. The final film morphology, chemical composition and growth rate were investigated by scanning electron microscopy (SEM), Raman spectroscopy and optical reflectance measurement. We observed, that increasing of CH4 concentration enhances the growth rate, but at the expense of the diamond film quality. Úplný záznam
	Influence of CO.sub.2./sub. concentration on diamond film morphology in pulsed linear antenna microwave plasma CVD system Domonkos, M. ; Ižák, Tibor ; Babchenko, Oleg ; Kromka, Alexander ; Hruška, Karel The diamond films were deposited in a pulsed linear antenna microwave plasma system. The influence of CO2 addition into the standard CH4/H2 gas mixture on the diamond film morphology was investigated. The concentration of CO2 varied from 0% up to 80% in CO2/CH4/H2 gas mixture. The film morphology, the growth rate and the ratio of sp3/sp2 carbon bonds were investigated. It was found that increasing of CO2 concentration resulted in enhanced growth rate (from 20 up to 36 nm/h). However, at very high CO2 concentrations (>40%) dominates etching instead of growth process. Moreover, we found that increasing of CO2 enhances the diamond film quality. Úplný záznam
	Deposition of carbon nanotubes by MW PECVD method Babchenko, Oleg ; Davydova, Marina ; Hruška, Karel ; Kromka, Alexander The report is about the growth of carbon nanotubes from CH4/H2 gas mixture applying linear antenna plasma system. We investigate growth of nanotubes in the different type of plasma and by using different catalyst particles. Úplný záznam
	Displacement Interferometry in Passive Fabry-Perot Cavity Lazar, Josef ; Číp, Ondřej ; Oulehla, Jindřich ; Pokorný, Pavel ; Fejfar, Antonín ; Stuchlík, Jiří We present techniques oriented to improvement of precision in incremental interferometric measurements of displacements over a limited range where the atmospheric wavelength of the coherent laser source is either directly stabilized to a mechanical reference or is corrected to fit to the reference. This may represent a reduction of uncertainty linking the laser wavelength not to indirectly evaluated refractive index but to the setup mechanics which cannot be completely eliminated. Here we suggest an approach where the traditional interferometers are replaced by a passive Fabry-Perot cavity with position sensing using an intracavity transparent photodetector. Úplný záznam
	Electrostatic assembly of alumina nanoparticles on nanocrystalline diamond films Verveniotis, Elisseos ; Kromka, Alexander ; Rezek, Bohuslav We apply atomic force microscope for local electrostatic charging of oxygen-terminated nanocrystalline diamond (NCD) thin films deposited on silicon, to induce electrostatically driven self-assembly of colloidal alumina nanoparticles into micro-patterns. The NCD films have sub-100 nm thickness and 60% relative sp2 phase content. We characterize charge contrast and stability in air, fluorocarbon oil and water by Kelvin force microscopy. We discuss factors influencing the charging process and demonstrate that the contrast of more than ± 1 V is needed to induce selfassembly of the nanoparticles via coulombic and polarization forces. Úplný záznam
	Characteristics of nanocrystalline diamond SGFETs under cell culture conditions Krátká, Marie ; Kromka, Alexander ; Rezek, Bohuslav ; Brož, A. ; Kalbáčová, M. Characterization of electronic properties of protein diamond interface by using microscopic (20 μm) solution-gated field-effect transistors (SGFET) based on H-terminated nanocrystalline diamond films (NCD) on glass. We show that NCD films with grain sizes down to 80 nm and thickness down to 100 nm are operational as SGFETs. Úplný záznam

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