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Pt and Pd as catalyst deposited by hydrogen reduction of metal salts on WO3 films for gasochromic application

Tahmasebi Garavand, N ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1016/j.apsusc.2013.02.027
  3. Publisher: 2013
  4. Abstract:
  5. In this study, tungsten oxide films were deposited by pulsed-laser deposition (PLD) technique. The as-deposited films were annealed at 250 °C in air for 1 h. The surface morphology, microstructure, crystalline phase, and chemical composition of the films were characterized by SEM, XRD and XPS techniques. Pt nanoparticles were deposited onto the tungsten oxide films through a two-step process. First of all, a layer of PtCl2 was coated on the WO3 surface by drop-drying the PtCl2 solution onto the WO3 surface at 60 °C. Consequently, the reduction of the PtCl2 into the metallic Pt nanoparticles was performed at 200 °C. In this study, the effect of the temperature during hydrogen reduction of PtCl2 as well as the influence of operating temperature on the gasochromic performance of Pt-WO3 samples were investigated. Results revealed that the gasochromic responses of the Pt-WO3 samples have attained approximately a constant value at temperatures above 90 °C. On the other hand, their responses are insignificant at temperatures below 90 °C. Additionally, for the sake of comparison, some results of the gasochromic performance of Pd-WO3 films were presented
  6. Keywords:
  7. As-deposited films ; Deposits ; Chemical compositions ; Crystalline phase ; Gasochromic ; Hydrogen reduction ; Operating temperature ; Tungsten oxide films ; Two-step process ; Tungsten oxide film ; Hydrogen ; Nanoparticles ; Oxide films ; Oxides ; Palladium ; Pulsed laser deposition ; Tungsten compounds ; Platinum
  8. Source: Applied Surface Science ; Volume 273 , May , 2013 , Pages 261-267 ; 01694332 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0169433213003358