The interfacial water structures at surfaces of an as-prepared TiO 2 and of the TiO 2 after UV irradiation were investigated by sum frequency generation (SFG) spectroscopy and quartz crystal microbalance (QCM). It was shown that UV illumination led to an increase in the amount not only of adsorbed water as a whole but also of the ordered adsorbed water on the TiO 2 surface, confirming the increase of hydrophilicity of the surface.
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Uosaki et al. (2004) studied this question.
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