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Structural and optical properties of Pd 2+-doped mesoporous TiO 2 thin films prepared by sol-gel templating technique

Yarmand, B ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. Publisher: 2010
  3. Abstract:
  4. Pd 2+-doped TiO 2 thin films with mesoporous structure were produced on quartz substrate by sol-gel dip coating. The structural, morphological and optical properties of the film were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), transmission electron microscopy (TEM), atomic force microscopy (AFM) and UV/vis transmittance spectroscopy. By increasing the Pd 2+ concentration from 0 to 6 mol%, the crystallites appeared solely as the anatase phase and their average sizes decreased from 10.5 to 7.1 nm. Addition of Pd 2+ also resulted in increasing of the specific surface area and decreasing of the pore size of the layer. The transmittance of the films decreased in the visible light region and the absorption edges shifted to the longer wavelengths by increasing of the Pd 2+ doped concentration. Optical band-gaps of the undoped and 6 mol% Pd 2+-doped films were 3.52 and 3.31 eV, respectively. The refractive index of the films decreased from 1.83 to 1.71 and their porosity increased from 56.3 to 63.7% by increasing of the Pd 2+ doping concentration from 0 to 6 mol%
  5. Keywords:
  6. Mesoporous TiO 2 ; Pd 2+-doped ; Structural and optical properties ; Thin films
  7. Source: Optoelectronics and Advanced Materials, Rapid Communications ; Volume 4, Issue 10 , 2010 , Pages 1572-1577 ; 18426573 (ISSN)