title: Structure and electrical properties of nanoparticulate tungsten oxide prepared by microwave plasma synthesis.
abstract: Nanoparticulate WO(3) films were prepared using microwave plasma synthesis and studied with respect to the electrical conductivity in dependence of ambient conditions. The WO(3) films with a monoclinic structure were made from cluster-assembled nanoparticles (diameter 3 nm) by means of dispersion and spin-coating. Above 100 °C a thermally activated decrease of the electrical resistance due to oxygen vacancy donors is found. A reversible increase of the electrical resistance R due to oxygen uptake is observed. The decrease of R in response to reducing H(2)S in the ppm range is studied in dependence of temperature and pre-annealing conditions.
authors.affiliation: Institute of Materials Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria.
authors.forename: M
authors.initials: M
authors.lastname: Sagmeister
authors.forename: M
authors.initials: M
authors.lastname: Postl
authors.forename: U
authors.initials: U
authors.lastname: Brossmann
authors.forename: E J W
authors.initials: EJ
authors.lastname: List
authors.forename: A
authors.initials: A
authors.lastname: Klug
authors.forename: I
authors.initials: I
authors.lastname: Letofsky-Papst
authors.forename: D V
authors.initials: DV
authors.lastname: Szabó
authors.forename: R
authors.initials: R
authors.lastname: Würschum
mesh_terms: D004553:Electric Conductivity; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D008872:Microwaves; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010087:Oxides / Q000737:chemistry*; D013499:Surface Properties; D014414:Tungsten / Q000737:chemistry*
chemical_list: D010087:Oxides; C511604:tungsten oxide; D014414:Tungsten