Morphology and gas response of nanocomposite structures based on irradiated ensembles of multi-walled carbon nanotubes and titanium oxide

Abstract

Nanocomposite structures are obtained on multi-walled carbon nanotubes pre-functionalized with argon ions and nonstoichiometric titanium oxide supported by magnetron deposition (MWCNT/TiOx). The morphology of the ensembles of individual MWCNT/TiOx composite nanostructures functionalized with argon ions and the gas response of these nanostructures to NO2 and H2S are studied. Irradiation of MWCNT layers leads to an increase in their resistance by a factor of 1.5. A change in the resistance of a MWCNT/TiOx nanocomposite upon gas adsorption repeats a similar change in the resistance of an ensemble of irradiated MWCNT, which demonstrate gas-sensitive properties characteristic of a material with p-type conductivity — a decrease in resistance during exposure in an oxidizing gas and an increase in resistance in a reducing gas.