Nanomaterials for environmental applications: Novel WO3-based gas sensors made by advanced gas deposition

A. Hoel, L. F. Reyes, P. Heszler, V. Lantto, Claes Goran Granqvist

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

Nanocrystalline WO3 films were prepared by gas evaporation and deposition. Their gas-sensing properties were investigated in two types of devices. Firstly, the films were exposed to a set of probing gases while the mean conductance change was recorded at various gas concentrations and temperatures. For example, 5 ppm of H2S yielded a conductance increase by ∼250 times even at room temperature, and doping by Al or Au enhanced the sensitivity still further. The maximum sensitivity for H2S, N2O, and CO was found at 400, 525, and 700 K, respectively. For another sensor arrangement, conduction noise was measured in the 0.5-45 Hz frequency range for thin Au films covered with WO3 nanoparticles. The power density of the conductance fluctuations was increased by about two orders of magnitude after alcohol exposure, while the mean resistance changed by less than 0.3%, thus showing the potential of fluctuation-based gas sensing.

Original languageEnglish
Pages (from-to)547-553
Number of pages7
JournalCurrent Applied Physics
Volume4
Issue number5
DOIs
Publication statusPublished - Aug 2004

Fingerprint

Chemical sensors
Nanostructured materials
Gases
sensors
gases
sensitivity
Carbon Monoxide
radiant flux density
Evaporation
alcohols
Alcohols
frequency ranges
Doping (additives)
evaporation
Nanoparticles
conduction
Thin films
nanoparticles
Temperature
Sensors

Keywords

  • Conductance fluctuation
  • Gas deposition
  • Gas sensor
  • Nanomaterial
  • Tungsten oxide

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Nanomaterials for environmental applications : Novel WO3-based gas sensors made by advanced gas deposition. / Hoel, A.; Reyes, L. F.; Heszler, P.; Lantto, V.; Granqvist, Claes Goran.

In: Current Applied Physics, Vol. 4, No. 5, 08.2004, p. 547-553.

Research output: Contribution to journalArticle

Hoel, A. ; Reyes, L. F. ; Heszler, P. ; Lantto, V. ; Granqvist, Claes Goran. / Nanomaterials for environmental applications : Novel WO3-based gas sensors made by advanced gas deposition. In: Current Applied Physics. 2004 ; Vol. 4, No. 5. pp. 547-553.
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