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Catalytic effect of copper oxide on H2S sensing properties of nanostructured WO3

Nowrouzi, R ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1166/sl.2013.3063
  3. Publisher: American Scientific Publishers , 2013
  4. Abstract:
  5. Cuprous oxide powder was added to WO3 sol as a catalyst and the composite sol was deposited on alumina substrates by spin coating process and annealing at 500 °C for 1 hour. Sensing properties of the pure and doped tungsten oxide samples to H2S gas were analyzed. WO 3-Cu2O (1%) samples showed good sensitivity towards 250 ppb of the gas at 100 °C and 1 ppm at room temperature (25 °C). Crystal structure, morphology and chemical composition of the sample were studied by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDAX) analyses and X-ray photoelectron spectroscopy (XPS). Based on these data, possible reaction mechanisms of hydrogen sulfide over WO 3-Cu2O (1%) surface based on dissociation of H 2S molecules and spillover of hydrogen atoms onto cracked WO 3 surface are discussed. Copyright
  6. Keywords:
  7. Catalytic additives ; Alumina ; Atoms ; Photoelectrons ; Scanning electron microscopy ; Sols ; X ray photoelectron spectroscopy ; Alumina substrates ; Catalytic additives ; Chemical compositions ; Cuprous oxide ; Energy dispersive x-ray ; Reaction mechanism ; Spin coating process ; X ray diffraction
  8. Source: Sensor Letters ; Volume 11, Issue 11 , 2013 , Pages 2015-2020 ; 1546198X (ISSN)
  9. URL: http://www.ingentaconnect.com/content/asp/senlet/2013/00000011/00000011/art00001?token=005c1ace9f38a810eb405847447b49766c5f403842314765667a33757e6f3f2f2730673f582f6b92d2b7cfaba010