999C1a:CEZ:AV0Z10100521 - Výsledky hledání - Digitální repozitář

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	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
	Development of Materials Science in Research and Education, Book of Abstracts of the 22nd Joint Seminar Kožíšek, Zdeněk ; Nitsch, Karel Topics: - Trends in development of materials research - Education of materials science at the universities - Information about the research programmes of individual institutions - Information on equipment for preparation and characterisation of materials - Results of materials science research Úplný záznam
	Pasivace poly-Si tenkovrstvých solárních článků ve vodní páře Pikna, Peter ; Fejfar, Antonín Vzorky polykrystalických křemíkových (poly-Si) solárních článků vyrobené firmou CSG Solar byly pasivovány ve vodní páře. Solární články po pasivaci připomínaly svým vzhledem články leptané ve směsi kyselin běžně používané na odstranění vrchní p+ vrstvy pro kontaktování spodní n+ vrstvy. Ačkoliv nebylo pozorováno výraznější zlepšení napětí naprázdno Voc, leptací efekt poly-Si ve vodě může stanovit horní hranice teploty, tlaku a doby vhodné pro pasivaci s minimálním negativním dopadem na článek. V neposlední řadě je prezentován také inovativní způsob kontaktování spodní n+ vrstvy na skle pro měření volt-ampérových charakteristik Suns-Voc metodou. Úplný záznam
	Potential for nanotechnology approaches in the production of crystalline and thin film silicon solar cells Poruba, Aleš ; Vaněček, Milan ; Bařinka, R. ; Čech, P. ; Wostrý, P. Increasing the solar cell conversion efficiency together with reducing their production cost are the trends of the last years which are necessary for the near future grid parity of "the energy from the sun". This paper deals mainly with the first part of trends, i.e., with enhanced cell efficiency while keeping the production cost nearly the same or even lower taking into account the potential for the implementation of nanotechnologies in both monocrystalline and thin film silicon devices. Úplný záznam
	Structuring of diamond films by reactive ion plasma etching Domonkos, M. ; Ižák, Tibor ; Proška, J. ; Kromka, Alexander In this study, two common strategies of diamond film structuring are described. Main focus is on the comparison of top-down and the bottom-up strategies. The top-down strategy is primary related to dry reactive ion etching through masking materials (or even without mask), while bottom-up strategy is based on selective area deposition of diamond film. Several methods of both strategies are demonstrated in details in the article, regarding to their properties and basic principles. Úplný záznam
	Magnetic properties of doped CeO.sub.2./sub. nanoparticles and CeO.sub.2./sub.-Fe.sub.2./sub.O.sub.3./sub. mixed oxides Mantlíková, Alice ; Bittová, Barbara ; Burianová, Simona ; Vejpravová, Jana ; Nižňanský, D. ; Holec, Petr We have investigated magnetic properties of CeO2 nanoparticles and CeO2/SiO2 nanocomposites doped by various magnetic metal oxide ions (Fe, Gd, Sm, Nd). Samples were obtained by co-precipitation and sol-gel method. Particle size has been obtained as 5 - 25 nm for nanocomposite and 25 - 100 nm for nanoparticles increasing with the increase of the annealing temperature. Detailed measurements of magnetization demonstrate paramagnetic state in the majority of the doped samples with maximum magnetization decreasing with the decrease of effective magnetic moment of the dopant ions from Gd3+ to Nd3+. It has been also observed, that the high-coercivity ε-Fe2O3 forms in CeO2-Fe2O3/SiO2 nanocomposite for higher concentration of the Fe ions (Ce/Fe/Si ratio equal to 1/2/9) and for the highest annealing temperature. 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

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