Improved H2-sensing performance of nanocluster-based highly porous tungsten oxide films operating at moderate temperature

Meng Zhao, Chung Wo Ong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

17 Citations (Scopus)


Many nano-metal oxides are claimed to be responsive to H2at room-temperature, but their response rates may be too low for the signal to reach equilibrium quickly. We investigated the H2-induced resistive response of palladium-coated supersonic cluster beam deposited tungsten oxide (Pd/SCBD WO3) films at temperatures Tsenbetween 20 and 140 °C. They are constructed of genuine nano WO3clusters (3-5 nm) loosely packed together, and have a high porosity. Slight increase of Tsenfrom room-temperature greatly speeds up the response rate and gives a strong apparent sensor response. Other advantages include excellent cyclic stability and selectivity against vapors of various organic compounds; negligible influence from moisture and mild ambient pressure dependence.
Original languageEnglish
Pages (from-to)65-73
Number of pages9
JournalSensors and Actuators, B: Chemical
Publication statusPublished - 1 Nov 2012


  • Fast response
  • H sensor 2
  • High cyclic stability
  • High porosity
  • WO nanoclusters 3

ASJC Scopus subject areas

  • Instrumentation
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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