Gas Sensitivity of Sol-gel Prepared Mesoporous WO3 thin Film

M. Takács, A. Pap

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Tungsten oxide thin film was prepared by sol-gel method from tungsten hexachloride (WCl6) precursor material in analytical grade ethanol. In order to form the porous nanostructured WO3 thin film Pluronic F127 was added to the solution. The sol-gel solution was deposited by spin coating on micro-hotplates containing interdigital platinum electrodes on top to measure the sensing layer conductivity. The porous tungsten oxide films were sensitized with ∼20nm platinum nanoparticles. Sensor responses of pure and sensitized porous WO3 were measured and their responses for 100ppm H2S in synthetic air were compared in the 140-260°C operation temperature range. The presence of platinum nanoparticles significantly increased the sensitivity for H2S gas. Test results of different operating temperatures were investigated in terms of sensitivity, stability and response time.

Original languageEnglish
Pages (from-to)289-292
Number of pages4
JournalProcedia Engineering
Volume168
DOIs
Publication statusPublished - 2016

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Keywords

  • gas sensor
  • mesoporous
  • platinum nanoparticles
  • tungsten oxide

ASJC Scopus subject areas

  • Engineering(all)

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