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Hydrogen sensor based on surface activated WO3 films by Pd nanoclusters

Fardindoost, S ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. Publisher: 2011
  3. Abstract:
  4. Tungsten trioxide has been prepared by using P-PTA as a precursor on alumina substrates by spin coating method. Palladium introduced on WO 3 film via electrolysis deposition by using palladium chloride as catalytic precursor. The catalytic precursor was introduced on the series of films with different morphologies. X-ray diffractometry (XRD), Scanning electron microscopy (SEM) and XPS were applied to analyze structure and morphology of the fabricated thin films. Then we measured variation of samples' electrical conductivity of pure and Pd added films in air and diluted hydrogen. Addition of Pd resulted in a remarkable improvement of the hydrogen sensing properties of WO 3 by detection of Hydrogen below 1% at room temperature. Also variation of the electrical conductivity in the presence of diluted hydrogen revealed that response of samples depends rather strongly on the palladium configuration on the surface
  5. Keywords:
  6. Palladium ; Alumina substrates ; Catalytic precursors ; Diluted hydrogen ; Electrical conductivity ; Hydrogen sensing ; Hydrogen sensing properties ; Hydrogen sensor ; Palladium chloride ; Room temperature ; SEM ; Spin-coating method ; Structure and morphology ; Tungsten trioxide ; WO3 films ; WO 3 ; X-ray diffractometry ; XPS ; Chemical sensors ; Chlorine compounds ; Electric conductivity ; Electrolysis ; Morphology ; Scanning electron microscopy ; Tungsten ; X ray diffraction analysis ; Hydrogen
  7. Source: World Academy of Science, Engineering and Technology ; Volume 76 , 2011 , Pages 639-642 ; 2010376X (ISSN)
  8. URL: http://waset.org/publications/843/hydrogen-sensor-based-on-surface-activated-wo3-films-by-pd-nanoclusters