Gas sensitivity of cobalt-, molybdenum- and palladium-modified nanostructured SnO2 films

摘要

Co3O4~-, MoO3~- and Pd-doped nanocrystalline SnO2 powders have been synthesized in a nitrate melt. The phase composition, microstructure, morphology, fineness and distribution of dopant have been studied by XRD, TEM, SEM, EDX. The sensitivity S of films of these powders to a number of alcohols (methanol, ethanol, propanol, butanol, isoamyl alcohol) and dimethylketone has been studied by electrical conductivity measurement. The effect of doping (increase in S) is due to the formation of the nanocomposite SnO2/dopant, in which the dopant either facilitates oxygen activation (Pd) or is an incomplete-oxidation (MoO3 Co3O4) catalyst.