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The first study on enhanced photoresponsivity of ZnO-TiO2 nanocomposite thin films by anodic polarization

Naseri, N ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1039/c0cp02103b
  3. Publisher: 2011
  4. Abstract:
  5. The physical and photoelectrochemical properties of the anodized ZnO-TiO2 thin films were investigated in this study. Impedance spectroscopy revealed a decrease in charge transfer resistance and Tafel plots determined enhancement of about 200 times in the exchange current (i 0) after anodization at high positive potential. It was found from XPS analysis that after applying the potential of 5 V to the ZnO-TiO2 photoelectrode, the lattice oxygen (O2-) in the thin film is oxidized to molecular oxygen and then, cations such as Zn2+ can be solved in the basic electrolyte and passed to the solution. Moreover, according to AFM analysis it was observed that the surface of the samples has been grooved by applying anodic voltage resulting in an increase of effective surface of the film. A mechanism for describing the significant enhancement in the photoresponse of the anodized layer is proposed
  6. Keywords:
  8. Source: Physical Chemistry Chemical Physics ; Volume 13, Issue 10 , Feb , 2011 , Pages 4239-4242 ; 14639076 (ISSN)
  9. URL: http://pubs.rsc.org/en/Content/ArticleLanding/2011/CP/c0cp02103b#!divAbstract