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Nano-TiO 2 powders were synthesized by the solvothermal method under various reaction conditions in order to obtain average crystallite sizes of 9–15nm. The amounts of surface defect of TiO 2 were measured by means of temperature-programmed desorption of CO 2 and electron spin resonance spectroscopy. It was found that the ratios of surface defect/specific surface area increased...
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