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Photocatalytic Activity of Reactively Sputtered Titania Coatings Deposited Using a Full Face Erosion Magnetron
Surface Engineering Group, Manchester Metropolitan University, Manchester, M1 5GD, UK
Millennium Inorganic Chemicals Ltd., a Cristal Global Company Grimsby, Lincolnshire, DN40 2PR, UK
Dalton Research Institute, Manchester Metropolitan University, Manchester, M1 5GD, UK
* Author to whom correspondence should be addressed.
Received: 19 July 2013; in revised form: 22 September 2013 / Accepted: 14 October 2013 / Published: 25 October 2013
Abstract: Titanium dioxide (titania) is widely used as a photocatalyst for its moderate band gap, high photoactivity, recyclability, nontoxicity, low cost and its significant chemical stability. The anatase phase of titania is known to show the highest photocatalytic activity, however, the presence of this phase alone is not sufficient for sustained activity. In this study TiO2 coatings were deposited onto glass substrates by mid-frequency pulsed magnetron sputtering from metallic targets in reactive mode using a Full Face Erosion (FFE) magnetron, which allows the magnetic field to be modulated during the deposition process. The as-deposited coatings were analysed 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-analysed. The photocatalytic activity of the coatings was investigated through measurements of the degradation of organic dyes, such as methyl orange, under the influence of UV and fluorescent light sources. It has been demonstrated that, after annealing, the pulsed magnetron sputtering process produced photo-active surfaces and that the activity of the coatings under exposure to fluorescent lamps was some 35%–45% of that observed under exposure to UV lamps.
Keywords: full face erosion magnetrons; magnetron sputtering; metal targets; photocatalytic coatings; Raman spectroscopy; methyl orange
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MDPI and ACS Style
Farahani, N.; Kelly, P.J.; West, G.; Hill, C.; Vishnyakov, V. Photocatalytic Activity of Reactively Sputtered Titania Coatings Deposited Using a Full Face Erosion Magnetron. Coatings 2013, 3, 177-193.
Farahani N, Kelly PJ, West G, Hill C, Vishnyakov V. Photocatalytic Activity of Reactively Sputtered Titania Coatings Deposited Using a Full Face Erosion Magnetron. Coatings. 2013; 3(4):177-193.
Farahani, Nick; Kelly, Peter J.; West, Glen; Hill, Claire; Vishnyakov, Vladimir. 2013. "Photocatalytic Activity of Reactively Sputtered Titania Coatings Deposited Using a Full Face Erosion Magnetron." Coatings 3, no. 4: 177-193.