Ultrathin percolated WO3cluster film and its resistive response to H2

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

doi:10.1016/j.jallcom.2014.05.108

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 publication › Journal article › Academic research › peer-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 language	English
Pages (from-to)	163-169
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	612
DOIs	https://doi.org/10.1016/j.jallcom.2014.05.108
Publication status	Published - 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

More information

10.1016/j.jallcom.2014.05.108

Cite this

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title = "Ultrathin percolated WO3cluster film and its resistive response to H2",

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.",

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AU - Zhao, Meng

AU - Wong, Man Hon

AU - Huang, Jian Xing

AU - Ong, Chung Wo

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AB - 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.

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