Rezek, Bohuslav - 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
	Surface-related 2D conductivity of nanocrystalline diamond in-plane nanowires Rezek, Bohuslav ; Babchenko, Oleg ; Vetushka, Aliaksi ; Verveniotis, Elisseos ; Ledinský, Martin ; Fejfar, Antonín ; Kromka, Alexander Diamond is an attractive material for nanoelectronics, biological interfaces and electrical transducers. Small device dimensions are highly demanded for higher sensitivity, parallelism, remote sensing and reduced costs. Recently we have demonstrated that directly grown nanocrystalline diamond micro-channels (down to 5 um widths) are feasible and fully operational as field-effect transistors using H-terminated surface conductivity. 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
	Polishing a polymer interlayers for diamond-diamond wafer bonding Babchenko, Oleg ; Verveniotis, Elisseos ; Ledinský, Martin ; Rezek, Bohuslav ; Vallin, Ö. ; Kromka, Alexander Surfaces of as-grown samples had high local peaks (detected by white light interferometer) that impede diamond to diamond bonding as directly as by employing interlayer polymer. Úplný záznam
	Photoluminescence study of light-induced modifications of (electro)chemically prepared polypyrrole Galář, P. ; Malý, P. ; Čermák, Jan ; Rezek, Bohuslav ; Kromka, Alexander Permanent modification of polypyrrole (Ppy) after UV light irradiation were studied by photoluminiscence (PL), optical absorption and X-ray photoelectron spectroscopy (XPS). Ppy samples were prepared by electrochemical anodic oxidation and chemical oxidation. Influence of light exposure on polymer properties was studied under ambient condition, low pressure and after polymer annealing from 300K to 520K. Úplný záznam
	Foreign substrates pre-treatment using polymer composites in plasma-enhanced CVD growth of diamond fibers and layers Potocký, Štěpán ; Babchenko, Oleg ; Ižák, Tibor ; Varga, Marián ; Kromka, Alexander ; Rezek, Bohuslav ; Tesárek, P. Nanocrystalline diamond wires and layers were grown by microwave plasma CVD technique on Si substrates. The substrates were pretreated by non-woven composite nanofiber textile composed by poly(vinyl alcohol) matrix and ultra-dispersed diamond (UDD) nanoparticles prepared by needleless electrospinning method. High concentration of UDD in the PVA fibers lead to formation of diamond wires due to a combined effect of UDD particles used as seeding and high pressure difference across the fibers interface. A preferable growth of diamond layers was observed on areas with a low porosity volume of nanofiber textile. The influence of spundond structure on the growth of diamond decreased with lowering of UDD concentra-tion in the primary polymer matrix. Úplný záznam
	Review of nanocrystalline diamond film deposition on silicon and glass substrates down to 400 °C Potocký, Štěpán ; Babchenko, Oleg ; Ižák, Tibor ; Varga, Marián ; Kromka, Alexander ; Rezek, Bohuslav ; Michalka, M. We present an overview of a nanocrystalline diamond (NCD) films deposition on silicon and glass substrates by microwave plasma CVD in hydrogen-based gas mixture. The temperature plays a crucial parameter as the diamond growth process is temperature controlled. Use of temperature sensitive substrates demanded reducing substrate temperature. Natural decrease of deposition rate resulted in search of new or nonstandard process parameters which could at least minimize or compensate it. Addition of oxygen containing gasses was found to improve film quality, and increasing deposition speed. Moreover improvement in pre-treatment of foreign substrates allowed deposition of fully closed films in less then 100 nm. Low thickness of NCD always favorable due to lattice mismatch between substrate material and NCD film. Successful adoption of NCD film deposition on silicon and glass allowed us to study surface chemical modification for protein attachment and DNA immobilization. Úplný záznam
	H-terminated diamond-capped impedance transducer: Novel molecular sensor Stehlík, Štěpán ; Ižák, Tibor ; Kromka, Alexander ; Dolenský, B. ; Havlík, M. ; Rezek, Bohuslav Sensitivity of an intrinsic nano-crystalline diamond (NCD) layer to naphthalene Trogers base derivative decorated with pyrrole groups(TBPyr) was characterized by impedance spectroscopy. The transducer was made of Au interdigitated electrodes (IDE) with 50um spacing on alumina substrate which were capped with the NCD layer. Úplný záznam
	Electrochemical growth of polypyrrole on boron doped diamonds Ukraintsev, Egor ; Kromka, Alexander ; Haenen, K. ; Rezek, Bohuslav To find out the mechanism of the electrochemical attachment of polypyrrole (Ppy) to diamond we grow Ppy layers on hydrogen and oxygen terminated boron doped diamond surfaces (BDD) using constant current applied between the BDD and the platinum wire. 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

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