TY - JOUR
T1 - Titanium dioxide and composite metal/metal oxide titania thin films on glass
T2 - A comparative study of photocatalytic activity
AU - Kafizas, Andreas
AU - Kellici, Suela
AU - Darr, Jawwad A.
AU - Parkin, Ivan P.
PY - 2009/4/2
Y1 - 2009/4/2
N2 - Titania and composite (Ag, Au, W) titania coatings were 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 activity of the coatings was determined by photomineralisation of stearic acid under 254, 365 nm and white light sources monitored by FT-IR spectroscopy. These activities at 254 and 365 nm light were represented as formal quantum efficiencies (FQEs) after determination of photon flux. Water contact angle measurements were made before and after irradiation with monochromatic 254 or 365 nm light; all films demonstrated photo-assisted super hydrophilicity (PSH). A Ag:Au titania composite coating was found to be the most significant photoactive film. The mode of improved photocatalytic activity was 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.
AB - Titania and composite (Ag, Au, W) titania coatings were 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 activity of the coatings was determined by photomineralisation of stearic acid under 254, 365 nm and white light sources monitored by FT-IR spectroscopy. These activities at 254 and 365 nm light were represented as formal quantum efficiencies (FQEs) after determination of photon flux. Water contact angle measurements were made before and after irradiation with monochromatic 254 or 365 nm light; all films demonstrated photo-assisted super hydrophilicity (PSH). A Ag:Au titania composite coating was found to be the most significant photoactive film. The mode of improved photocatalytic activity was 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.
KW - Comparative
KW - Composite
KW - Formal quantum efficiency (FQE)
KW - Photocatalysis
KW - Thin film
KW - TiO
UR - https://www.scopus.com/pages/publications/65449155602
U2 - 10.1016/j.jphotochem.2009.03.017
DO - 10.1016/j.jphotochem.2009.03.017
M3 - Article
SN - 1010-6030
VL - 204
SP - 183
EP - 190
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 2-3
ER -