National Repository of Grey Literature 4 records found  Search took 0.00 seconds. 
Hydrogen-terminated diamond surface as gas sensing layer working at room temperature
Davydova, Marina ; Kulha, P. ; Babchenko, Oleg ; Kromka, Alexander
Effect of fluorine- and hydrogen-terminated diamond surface on the gas sensing properties at room temperature was investigated. The gas sensing properties diamond-based sensor were measured by the changes of electrical resistance to various volatile organic compounds (C6H6, C3H6O, isopropylalcohol) and relative humidity. The comparative sensing performance of hydrogenated diamond surface shows improvement in sensitivity toward benzene, acetone, isopropylalcohol and humid air in contrast to fluorinated diamond surface, where the surface conductivity was suppressed.
Gas sensing properties of IDT devices employing H-terminated NCD films and their nano-structures
Kromka, Alexander ; Davydova, Marina ; Babchenko, Oleg ; Rezek, Bohuslav ; Stuchlík, Jiří
Embedded metal electrode in IDTs (novel concept). Surface conductivity, H-termination of is crucial. Surface conductivity sensitive to testing gas (oxidizing/reducing). Largest surface conductivity for fosgene. Temperature experiments, optimal temperature.
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.
Pulsed linear antenna microwave plasma – a step ahead in large area material depositions and surface functionalization
Kromka, Alexander ; Babchenko, Oleg ; Ižák, Tibor ; Potocký, Štěpán ; Davydova, Marina ; Neykova, Neda ; Kozak, Halyna ; Remeš, Zdeněk ; Hruška, Karel ; Rezek, Bohuslav
A technological progress in the large area growth of diamond films and carbon nanotubes by the modified linear antenna MW system is presented. We show a correlation between process parameters and nano- or poly-crystalline film character. A challenging part, diamond coated mirrors or ATR prisms, are shown as multifunctional optical elements suitable for detection of absorbed molecules. Additional positive feature of the presented plasma system is low temperature hydrogen functionalization of diamond films. Finally, we present that combination of pulsed MW plasma with radiofrequency substrate biasing results in growth of oriented CNTs over large area.

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1 Davydova, Maria
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