UV induced local heating effects in TiO2nanocrystals

Literature Information

Publication Date 2006-03-02
DOI 10.1039/B517107E
Impact Factor 3.676
Authors

Thomas Berger, Oliver Diwald, Erich Knözinger, Martin Sterrer, John T. Yates Jr


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Abstract

When isolated TiO2 nanocrystals are subjected to UV light at 77 K and pressures below 10−6 mbar, trapping of photogenerated hole centers occurs on the surface of the nanocrystals and can be tracked by time-resolved electron paramagnetic resonance spectroscopy. Irrespective of the selected UV irradiance used, the maximum concentration of trapped charges was found to be constant for a given number of nanocrystals (∼1015) and corresponds to one electron–hole pair per particle. On a time scale of seconds to minutes the dynamics for the trapping process depend on the number of photons with supra band gap energy. A local temperature rise of the TiO2 nanocrystals was observed for irradiances above 1.55 mW cm−2 (1015 photons cm−2 s−1). This is attributed to enhanced nonradiative recombination of photogenerated charge carriers via heat production and points to a substantial contribution of thermal chemistry in photocatalytic reaction cycles.

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Physical Chemistry Chemical Physics
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