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Effect of the excimer laser irradiation on sol–gel derived tungsten–titanium dioxide thin films

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Abstract

A novel technique based on the excimer laser induced crystallization and modification of TiO2 thin films is being reported. W+6 ions loaded TiO2 (WTO) precursor films were prepared by a modified sol–gel method and spin-coated onto microscopic glass slides. Pulsed KrF (248 nm, 13 ns) excimer laser was used to irradiate the WTO amorphous films at various laser parameters. Mesoporous and nanostructured films consisting of anatase and rutile were obtained after laser irradiation at room temperature. The effect of varying W+6 ions concentrations on structural and optical properties the WTO films was analyzed by X-ray diffraction, field-emission scanning electron microscope, UV-Vis spectrophotometer and transmission electron microscope before and after laser treatment. Films irradiated for 10 pulses at 65–75 mJ/cm2 laser fluence, exhibited anatase whereas higher parameters promoted the formation of rutile. XPS results revealed WO3 along with minor proportion of WO2 compounds after laser irradiation. Photo-absorbance of the WTO films was increased with increase in W+6 ions concentration in the film. TEM results exhibited a crystallite size of 15 nm which was confirmed from SEM results as well.

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Authors and Affiliations

  1. Corrosion and Protection Centre, The Mill, School of Materials, The University of Manchester, Manchester, M13 9PL, UK

    Yasir F. Joya & Zhu Liu

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  1. Yasir F. Joya
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  2. Zhu Liu
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Correspondence to Yasir F. Joya.

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Joya, Y.F., Liu, Z. Effect of the excimer laser irradiation on sol–gel derived tungsten–titanium dioxide thin films. Appl. Phys. A 102, 91–97 (2011). https://doi.org/10.1007/s00339-010-6151-9

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  • DOI: https://doi.org/10.1007/s00339-010-6151-9

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