WO3 nano-rods sensitized with noble metal nano-particles for H2S sensing in the ppb range

Máté Takács, Dániel Zámbó, A. Deák, A. Pap, C. Dücső

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Hydrothermally grown hexagonal WO3 nano-rods were sensitized by additional Pt and Au nano-particles. The size of the 20–29 nm noble metal nano-particles were stabilized with methoxy-polyethylene glycol, and their solution was mixed with the tungsten-oxide nano-rod suspension. Controlled sized suspension drops of activated and pure reference material were deposited on the top of micro-hotplate with gold interdigital electrodes on top. The gas sensitive properties were measured for NH3 and H2S in a temperature range of 140–300 °C. Noble metal nano-particles multiplied the gas sensitivity for H2S, whereas no significant effect could be detected for NH3. With gold nano-particles a lower detection limit of 25 ppb could be achieved. The response time is in the range of 30–80 s, whereas typically 300 s is needed for complete recovery.

Original languageEnglish
Pages (from-to)480-485
Number of pages6
JournalMaterials Research Bulletin
Volume84
DOIs
Publication statusPublished - Dec 1 2016

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Keywords

  • A. Nanostructures
  • A. Oxides
  • A. Semiconductuctors
  • D. Catalytic properties
  • D. Surface properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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