Ultrathin percolated WO3cluster film and its resistive response to H2

Meng Zhao, Man Hon Wong, Jian Xing Huang, Chung Wo Ong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)

Abstract

Thin films composed of tungsten oxide (WO3) nanoclusters were fabricated by oxidizing supersonic cluster beam deposited tungsten films at various temperatures. Oxidation at 700 °C resulted in aggregation of the deposits, forming a percolated network of WO3spherical caps connected by fine links. The resistance response of the palladium-(Pd-) coated film sample to hydrogen (H2) was investigated. The response rate was faster than those of other samples oxidized at lower temperatures. This is the result of the rapid electrical switching of the intercluster links between the highly resistive depleted state and conducting hydrogenated state. The possibility of improving the H2sensing response rate with the use of the percolated WO3film structure is illustrated.
Original languageEnglish
Pages (from-to)163-169
Number of pages7
JournalJournal of Alloys and Compounds
Volume612
DOIs
Publication statusPublished - 5 Nov 2014

Keywords

  • Hydrogen sensing properties
  • Tungsten oxide nanoclusters
  • Ultrathin percolated network

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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