Photocatalytic Activity of Reactively Sputtered Titania Coatings Deposited Using a Full Face Erosion Magnetron

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 TiO 2 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.

Cost-Effective, Wireless, Portable Device for Estimation of Hexavalent Chromium, Fluoride, and Iron in Drinking Water

“…As can be seen from the resulting spectra, the absorption maxima do not shift significantly with increasing concentrations of MO. From literature values, it is observable that MO at pH 4 absorbs at about 464 nm . Our result complies with those literature values with an error of ±5 nm.…”

“…From literature values, it is observable that MO at pH 4 absorbs at about 464 nm. 45 Our result complies with those literature values with an error of ±5 nm.…”

Production and testing of novel photocatalytic TiO2 surface-exposed nanoparticle (TiO2-SEN) thin plastic films

“…However, in contrast to the Rz solution test, the Rz ink is very easily applied, quick to respond and easy to assess. As a result, it, and other paii's, are proving increasingly popular as a quick method for assessing the photocatalytic activities of surfaces [35][36][37][38][39][40][41][42].…”

Photocatalyst activity indicating adhesive labels for use in the field

“…Examples of the growing use of paiis are given in Error! Not a valid bookmark selfreference.. Table 1: Examples of paiis used as an assessment technique for a variety of photocatalytic surfaces [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] Ref Paii(s) used Materials tested / comments [10] Rz/HEC Activ™; CVD b TiO2 films; first use of pen as an application method [11] Rz/HEC CVD TiO2 films; first use of aerosol spray as application method [12] Rz/HEC; BB66/HEC, AV7 Of all the techniques used to apply the ink, the drawdown method, using a K-bar, is the most popular, since it delivers a highly reproducible film on a smooth surface, yielding a wet ink film, thickness ca. 24 m, which then dries within 10-15 min to form a film ca.…”