Structure and electrical properties of nanoparticulate tungsten oxide prepared by microwave plasma synthesis

M Sagmeister; M Postl; U Brossmann; E J W List; A Klug; I Letofsky-Papst; D V Szabó; R Würschum

doi:10.1088/0953-8984/23/33/334206

Structure and electrical properties of nanoparticulate tungsten oxide prepared by microwave plasma synthesis

J Phys Condens Matter. 2011 Aug 24;23(33):334206. doi: 10.1088/0953-8984/23/33/334206. Epub 2011 Aug 3.

Authors

M Sagmeister¹, M Postl, U Brossmann, E J W List, A Klug, I Letofsky-Papst, D V Szabó, R Würschum

Affiliation

¹ Institute of Materials Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria.

PMID: 21813964
DOI: 10.1088/0953-8984/23/33/334206

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.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Electric Conductivity
Materials Testing
Metal Nanoparticles / chemistry*
Microscopy, Electron, Transmission
Microwaves*
Nanostructures / chemistry*
Nanostructures / ultrastructure
Oxides / chemistry*
Surface Properties
Tungsten / chemistry*

Substances

Oxides
tungsten oxide
Tungsten