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HiPIMS deposition of tungsten-doped titania coatings for photocatalytic applications

Ratova, M and West, GT and Kelly, PJ (2013) HiPIMS deposition of tungsten-doped titania coatings for photocatalytic applications. Vacuum, 102. ISSN 0042-207X

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Abstract

Tungsten-doped titania coatings have been deposited from a Ti-5 at.% W alloy target in HiPIMS mode. The coatings were weakly crystalline and showed mixed anatase/rutile structures in the as-deposited condition. Their photocatalytic activity was assessed in terms of the degradation rate of methylene blue dye. The W-doped coatings showed no improvement in activity, compared to pure titania coatings under UV irradiation, however under fluorescent and visible light sources, the activity was significantly enhanced. This was attributed to a red-shift in the band gap energy of the doped coatings.

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