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Journal articleKafizas A, Kellici S, Darr JA, et al., 2009,
Titanium dioxide and composite metal/metal oxide titania thin films on glass: A comparative study of photocatalytic activity
, Journal of Photochemistry and Photobiology A: Chemistry, Vol: 204, Pages: 183-183, ISSN: 1010-6030Titania and composite (Ag, Au, W) titania coatingswere prepared on glass microscope slides via a sol–gel dip-coating method. The resulting coatings were characterised by X-ray diffraction, Raman, scanning electron microscopy (SEM),wavelength dispersive X-ray (WDX), Brunauer–Emmett–Teller (BET) surface area analysis, atomic force microscopy (AFM) and UV–visible absorption techniques. Photocatalytic activ- ity of the coatings was determined by photomineralisation of stearic acid under 254, 365nm and white light sources monitored by FT-IR spectroscopy. These activities at 254 and 365nmlightwere represented as formal quantum efficiencies (FQEs) after determination of photon flux. Water contact angle mea- surements were made before and after irradiation with monochromatic 254 or 365nm light; all films demonstrated photo-assisted super hydrophilicity (PSH). A Ag:Au titania composite coatingwas found to be the most significant photoactive film. The mode of improved photocatalytic activitywas postulated in terms of a charge separation model. The Ag:Au TiO2 coating showed potential as a useful coating for hard self-cleaning surfaces due to its robustness, stability to cleaning and reuse and its photoactive response to indoor lighting conditions. ©
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Conference paperKafizas A, Dunnill CW, Hyett G, et al., 2009,
Combinatorial CVD: New Oxynitride Photocatalysts
, Joint Conference on EuroCVD / 17th International Chemical Vapor Deposition Symposium (CVD) held jointly at the 216th Meeting of the Electrochemical-Society, Publisher: ELECTROCHEMICAL SOC INC, Pages: 1239-1250, ISSN: 1938-5862- Author Web Link
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Journal articleDunnill CW, Aiken ZA, Kafizas A, et al., 2009,
White light induced photocatalytic activity of sulfur-doped TiO2 thin films and their potential for antibacterial application
, Journal of Materials Chemistry, Vol: 19, Pages: 8747-8747, ISSN: 0959-9428 -
Journal articleKafizas A, Hyett G, Parkin IP, 2009,
Combinatorial atmospheric pressure chemical vapour deposition (cAPCVD) of a mixed vanadium oxide and vanadium oxynitride thin film
, Journal of Materials Chemistry, Vol: 19, Pages: 1399-1399, ISSN: 0959-9428A novel combinatorial atmospheric pressure chemical vapour deposition (cAPCVD) technique was used to synthesise numerous vanadium oxide and vanadium oxynitride phases on a single film. This is the first example of cAPCVD having been used to synthesise a gradating mixed anion system. The film was characterised by X-ray diffraction (XRD) mapping, Raman, wavelength dispersive X-ray analysis (WDX) and X-ray photoelectron spectroscopy (XPS) analysis of positions along the film’s front edge allowed the chemical composition to be determined and correlated with XRD data. Film thicknesses were determined using side-on scanning electron microscopy (SEM). Functional property mapping of the optical transmittance/reflectance and electrical resistance allowed systematic investigation on the effects of oxygen content within a vanadium oxynitride film. cAPCVD used in conjunction with mapping analysis tools is a shortcut for identifying numerous, phases, compositions and properties and their relationships on a single film, and offers a rapid method for analysis of phase-space.
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