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Coatings 2013, 3(3), 153-165; doi:10.3390/coatings3030153
Article

An Investigation into W or Nb or ZnFe2O4 Doped Titania Nanocomposites Deposited from Blended Powder Targets for UV/Visible Photocatalysis

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Received: 27 June 2013; in revised form: 5 August 2013 / Accepted: 6 August 2013 / Published: 14 August 2013
(This article belongs to the Special Issue Novel Thin Film Materials for Photovoltaic Applications)
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Abstract: The photocatalytic behavior of titania coatings is largely determined by their crystalline structure. Depending on deposition conditions, though, titania may form amorphous, brookite, anatase or rutile structures, with anatase or anatase/rutile mixed phase structures showing the highest levels of activity. Anatase is activated by UV light and, consequently, there is a great deal of interest in doping titania films to both increase activity and extend it into the visible range. In this study, titania and doped titania coatings have been deposited from blended oxide powder targets. This highly versatile and economical technique allows dopant levels to be readily varied. Using this technique, titania coatings doped with W, Nb and ZnFe2O4 have been deposited onto glass substrates by pulsed magnetron sputtering. The as-deposited coatings were analyzed by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and micro-Raman spectroscopy. Selected coatings were then annealed at temperatures in the range of 400–700 °C and re-analyzed. Structural transformation of the titania coatings was initiated in the 500–600 °C range, with the coatings annealed at 700 °C having predominantly anatase structures. The photocatalytic activity of the coatings was assessed through measurements of the degradation of organic dyes, such as methyl orange, under the influence of UV and fluorescent light sources. It was found that, after annealing, coatings with photo-active surfaces were produced and that activity varied with dopant content. Activity levels under fluorescent light irradiation were up to 60% of the activity measured under UV irradiation.
Keywords: magnetron sputtering; powder targets; photocatalytic coatings; Raman spectroscopy; methyl orange magnetron sputtering; powder targets; photocatalytic coatings; Raman spectroscopy; methyl orange
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Farahani, N.; Kelly, P.J.; West, G.; Ratova, M.; Hill, C.; Vishnyakov, V. An Investigation into W or Nb or ZnFe2O4 Doped Titania Nanocomposites Deposited from Blended Powder Targets for UV/Visible Photocatalysis. Coatings 2013, 3, 153-165.

AMA Style

Farahani N, Kelly PJ, West G, Ratova M, Hill C, Vishnyakov V. An Investigation into W or Nb or ZnFe2O4 Doped Titania Nanocomposites Deposited from Blended Powder Targets for UV/Visible Photocatalysis. Coatings. 2013; 3(3):153-165.

Chicago/Turabian Style

Farahani, Nick; Kelly, Peter J.; West, Glen; Ratova, Marina; Hill, Claire; Vishnyakov, Vladimir. 2013. "An Investigation into W or Nb or ZnFe2O4 Doped Titania Nanocomposites Deposited from Blended Powder Targets for UV/Visible Photocatalysis." Coatings 3, no. 3: 153-165.


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