Gas sensing selectivity of hexagonal and monoclinic WO3 to H2S

Imre Miklós Szilágyi, Sami Saukko, J. Mizsei, A. Tóth, J. Madarász, G. Pokol

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Hexagonal and monoclinic tungsten oxide (h- and m-WO3) samples were produced by annealing hexagonal ammonium tungsten bronze, (NH 4)0.07(NH3)0.04(H2O) 0.09WO2.95 at 470 and at 600 °C, respectively. Their structure, composition and morphology were analyzed by XRD, Raman, XPS, 1H-MAS NMR and SEM. In order to study the effect of crystal structure on the gas sensitivity of tungsten oxides, h- and m-WO3 were tested as gas sensors to CH4, CO, H2, NO and H2S (1000 and 10 ppm) at 200 °C. Monoclinic WO3 responded to all gases, but its gas sensing signal was two magnitudes greater to 10 ppm H2S than to other gases, and it also detected H2S even at 25 °C. Hexagonal WO3 responded only to 10 ppm H2S. Its sensitivity was smaller compared to m-WO3, however, the response time of h-WO3 was significantly faster. The gas sensing tests showed that while m-WO3 had relative selectivity to H2S in the presence CH4, CO, H2, NO; h-WO3 had absolute selectivity to H2S in the presence these gases.

Original languageEnglish
Pages (from-to)1857-1860
Number of pages4
JournalSolid State Sciences
Volume12
Issue number11
DOIs
Publication statusPublished - Nov 2010

Fingerprint

Gases
selectivity
gases
Tungsten
Carbon Monoxide
tungsten oxides
Oxides
Bronze
Chemical sensors
Ammonium Compounds
bronzes
X ray photoelectron spectroscopy
Crystal structure
Nuclear magnetic resonance
Annealing
tungsten
Scanning electron microscopy
nuclear magnetic resonance
scanning electron microscopy
crystal structure

Keywords

  • Gas sensor
  • HS
  • Hexagonal
  • Monoclinic
  • Selectivity
  • Tungsten oxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Gas sensing selectivity of hexagonal and monoclinic WO3 to H2S. / Szilágyi, Imre Miklós; Saukko, Sami; Mizsei, J.; Tóth, A.; Madarász, J.; Pokol, G.

In: Solid State Sciences, Vol. 12, No. 11, 11.2010, p. 1857-1860.

Research output: Contribution to journalArticle

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