Enhanced properties of magnetron sputtered photocatalytic coatings via transition metal doping

Ratova, Marina; Kelly, Peter; West, G.T.; Iordanova, I.

doi:10.1016/j.surfcoat.2012.04.037

Cited by 37 publications

(53 citation statements)

References 22 publications

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“…Mo was used as a dopant to reduce the band gap of TiO 2 in order to improve the visible light activity of TiO 2 . Mo-TiO 2 has been reported to shift the band gap of TiO 2 by −0.20 eV [28]. The photoactivity and mechanical properties of the surfaces were studied for the as-prepared coatings and those having undergone process conditions.…”

Section: Resultsmentioning

confidence: 99%

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Photocatalytic TiO2 and Doped TiO2 Coatings to Improve the Hygiene of Surfaces Used in Food and Beverage Processing—A Study of the Physical and Chemical Resistance of the Coatings

et al. 2014

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TiO 2 coatings deposited using reactive magnetron sputtering and spray coating methods, as well as Ag-and Mo-doped TiO 2 coatings were investigated as self-cleaning surfaces for beverage processing. The mechanical resistance and retention of the photocatalytic properties of the coatings were investigated over a three-month period in three separate breweries. TiO 2 coatings deposited using reactive magnetron sputtering showed better mechanical durability than the spray coated surfaces, whilst the spray-deposited coating showed enhanced retention of photocatalytic properties. The presence of Ag and Mo dopants improved the photocatalytic properties of TiO 2 as well as the retention of these properties. The spray-coated TiO 2 was the only coating which showed light-induced hydrophilicity, which was retained in the coatings surviving the process conditions. OPEN ACCESSCoatings 2014, 4 434

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Section: Resultsmentioning

confidence: 99%

“…The equation below was used to calculate the photocatalytic activity of each of the films. Two parameters were defined: Pa UV for UV irradiation and Pa FL for fluorescent light irradiation [28]. …”

Section: Photocatalytic Characterization Of Coatingsmentioning

confidence: 99%

Photocatalytic TiO2 and Doped TiO2 Coatings to Improve the Hygiene of Surfaces Used in Food and Beverage Processing—A Study of the Physical and Chemical Resistance of the Coatings

et al. 2014

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“…The emission spectrum of the light source is given elsewhere [36]. A 4 g load of the coated beads was used for each experiment; prior to the MB degradation tests the samples were immersed into 40 mL of conditioning solution of MB for 30 min in the dark with gentle magnetic stirring to reach adsorption-desorption equilibrium.…”

Section: Laboratory Assessment (Fluorescent Irradiation Source)mentioning

confidence: 99%

Reactive Magnetron Sputter Deposition of Bismuth Tungstate Coatings for Water Treatment Applications under Natural Sunlight

et al. 2017

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Bismuth complex oxides, in particular, bismuth tungstate, have recently attracted attention as promising photocatalytic materials for water treatment processes. In the present work, photocatalytic bismuth tungstate films were prepared by pulsed direct current (DC) reactive magnetron sputtering of Bi and W targets in an Ar/O 2 atmosphere onto spherically-shaped glass beads. The uniform coverage of the substrate was enabled by the use of oscillating bowl placed underneath the magnetrons. The atomic ratio of Bi/W was varied through the variation of the power applied to the magnetrons. The deposited coatings were analyzed by the scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy and atomic force microscopy. The photocatalytic properties of the films were studied via the methylene blue (MB) degradation process under artificial (fluorescent light) and natural (sunlight) irradiation, and compared to the photocatalytic performance of titanium dioxide coatings deposited onto identical substrates. The results showed that the photocatalytic performance of bismuth tungstate and bismuth oxide-coated beads was superior to that exhibited by TiO 2 -coated beads. Overall, reactive magnetron co-sputtering has been shown to be a promising technique for deposition of narrow band gap bismuth-based semiconducting oxides onto irregularly-shaped substrates for potential use in water treatment applications.

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“…This technique is known to produce all forms of titania surfaces including highly photo-active anatase [24]. The full face erosion (FFE) magnetron used for the process, has the capability to oscillate the central pole at various speeds during operation.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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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.

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Enhanced properties of magnetron sputtered photocatalytic coatings via transition metal doping

Cited by 37 publications

References 22 publications

Photocatalytic TiO2 and Doped TiO2 Coatings to Improve the Hygiene of Surfaces Used in Food and Beverage Processing—A Study of the Physical and Chemical Resistance of the Coatings

Photocatalytic TiO2 and Doped TiO2 Coatings to Improve the Hygiene of Surfaces Used in Food and Beverage Processing—A Study of the Physical and Chemical Resistance of the Coatings

Reactive Magnetron Sputter Deposition of Bismuth Tungstate Coatings for Water Treatment Applications under Natural Sunlight

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

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