Pt/WO 3 thin films prepared by photochemical metal-organic deposition (PMOD) and its evaluation as carbon monoxide sensor

G. E. Buono-Core, A. H. Klahn, G. Cabello, EDUARDO CARLO MUÑOZ CARTAGENA, M. J. Bustamante, C. Castillo, B. Chornik

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Pure and 10% Pt-loaded tungsten oxide thin films have been successfully prepared by direct UV irradiation of bis(β-diketonate)dioxotungsten(VI) and Pt(II) precursor complexes spin-coated on Si(1 0 0) substrates. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) techniques were used to analyze the crystal structure and chemical composition of the films before and after heat treatment at 500°C. The results of XRD and AFM analysis showed that the as-photodeposited films are amorphous and have a rougher surface than thermally treated films. Post-annealing of the films in air at 500°C transforms the oxides to a monoclinic WO 3 phase. Gas sensing tests reveal that annealed 10% Pt/WO 3 films exhibit a better response than unloaded WO 3 films towards 20 ppm carbon monoxide at an operating temperature of 350°C. The sensors also posses fast response and recovery characteristics.

Original languageEnglish
Pages (from-to)134-139
Number of pages6
JournalPolyhedron
Volume41
Issue number1
DOIs
StatePublished - 28 Jun 2012
Externally publishedYes

Keywords

  • Catalytic properties
  • Photoelectron spectroscopy
  • Thin films
  • X-ray diffraction

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