UV induced local heating effects in TiO2nanocrystals
Literature Information
Thomas Berger, Oliver Diwald, Erich Knözinger, Martin Sterrer, John T. Yates Jr
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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