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Effect of tungsten (W6+) metal ion dopant on structural, optical and photocatalytic activity of SnO2 nanoparticles by a novel microwave method

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Abstract

In this report, we have successfully synthesized pristine and tungsten (W) doped SnO2 nanoparticles by using novel and one-step microwave irradiation method for the first time. Powder X-ray diffraction results suggest that both pure and W doped SnO2 nanoparticles are crystalline with tetragonal rutile type structure (space group of P42/mnm) formed directly during the microwave irradiation process. The morphology of the nanoparticles are in spherical shaped and the average particle sizes were around 23–32 nm was observed for pure and W doped SnO2 nanoparticles as investigated by transmission electron microscopy analysis. UV–Vis transmission spectra analysis revealed that optical transmission is decreases with the increase of W concentrations (0–10 wt%) and the red shift was observed. The calculated band gap energy of pure SnO2 was found to be 3.61 eV and further it was decreases to 3.47 eV for W (10 wt%) doped SnO2. The photocatalytic properties of the pure and W doped SnO2 samples were evaluated by the degradation of methylene blue rhodamine B in an aqueous solution under visible light irradiation. The photocatalytic activity and reusability of W (10 wt%) doped SnO2 was much higher than that of the pristine SnO2. The improvement mechanism by W doping was also discussed. The samples were further characterized by photoluminescence and Fourier transforms infra- red spectra analysis.

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Authors and Affiliations

  1. Research and Development Centre, Bharathiar University, Coimbatore, Tamilnadu, 641 046, India

    P. Rajeshwaran

  2. Department of Chemistry, Government Arts College, Thiruverumbur, Tamilnadu, 620 022, India

    A. Sivarajan

  3. Department of Chemistry, Paavai Engineering College, Namakkal, Tamilnadu, 637 018, India

    G. Raja

  4. Department of Physics, KSR Polytechnic College, Tiruchengode, Tamilnadu, 637 215, India

    D. Madhan

  5. Department of Physics, TRP Engineering College, Trichy, Tamilnadu, 621 105, India

    P. Rajkumar

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  1. P. Rajeshwaran
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  2. A. Sivarajan
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  3. G. Raja
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  4. D. Madhan
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  5. P. Rajkumar
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Correspondence to P. Rajeshwaran.

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Rajeshwaran, P., Sivarajan, A., Raja, G. et al. Effect of tungsten (W6+) metal ion dopant on structural, optical and photocatalytic activity of SnO2 nanoparticles by a novel microwave method. J Mater Sci: Mater Electron 27, 2419–2425 (2016). https://doi.org/10.1007/s10854-015-4040-x

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  • DOI: https://doi.org/10.1007/s10854-015-4040-x

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