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Effect of W doping on structural, optical and photocatalytic activity of SnO2 nanostructure thin films

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Abstract

Thin films of undoped and tungsten (W) doped SnO2 have been synthesized on a glass (ITO) substrate using a simple chemical bath deposition technique. The as-deposited films were annealed at 500 °C for 5 h in ambient atmosphere in order to improve the structural perfections and crystallinity. X-ray diffraction studies showed that the W: SnO2 films were polycrystalline in nature with tetragonal rutile type structure of SnO2 phase. The surface roughness and porosity have been found to decrease from 47 to 39 nm with the increase of dopant concentration as investigated by atomic force microscopy. The optical absorption edge was found to be 3.46 eV, while the higher concentration of W doped films shifted towards lower energy (red shift) in the range of 3.35 eV. The effect of W on impurity, defect states and oxygen vacancy of the SnO2 film was analyzed by photoluminescence spectra. The photocatalytic activities of the films were evaluated by the degradation of methylene blue (MB) rhodamine B (RHB) in an aqueous solution under visible light irradiation. The photocatalytic activity and reusability of W (10 wt%) doped SnO2 films were much higher than that of the pure SnO2. The improvement mechanism of RHB by W-SnO2 catalyst was also discussed.

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Authors and Affiliations

  1. Department of Physics, Paavai Engineering College, Namakkal, 637 018, Tamilnadu, India

    S. Vadivel

  2. Department of Physics, Selvam College of Technology, Namakkal, 637 003, Tamilnadu, India

    G. Rajarajan

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  1. S. Vadivel
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  2. G. Rajarajan
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Correspondence to S. Vadivel.

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Vadivel, S., Rajarajan, G. Effect of W doping on structural, optical and photocatalytic activity of SnO2 nanostructure thin films. J Mater Sci: Mater Electron 26, 7127–7133 (2015). https://doi.org/10.1007/s10854-015-3335-2

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  • DOI: https://doi.org/10.1007/s10854-015-3335-2

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