UV induced local heating effects in TiO2 nanocrystals

Physical Chemistry Chemical Physics : PCCP
T BergerJohn T Yates

Abstract

When isolated TiO(2) 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 ( approximately 10(15)) 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 TiO(2) nanocrystals was observed for irradiances above 1.55 mW cm(-2) (10(15) 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.

References

Mar 24, 2005·Physical Review Letters·Gilberto DominguesJean-Jacques Greffet
Oct 7, 2005·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Thomas BergerErich Knözinger
Jul 21, 2006·The Journal of Physical Chemistry. B·T BergerJ T Yates
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Jul 21, 2006·The Journal of Physical Chemistry. B·Tracy L Thompson, John T Yates
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Citations

Apr 15, 2016·Environmental Science and Pollution Research International·Rusul Khaleel IbrahimShaliza Ibrahim
Feb 15, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Augusto MárquezOliver Diwald
Sep 20, 2018·Physical Chemistry Chemical Physics : PCCP·Fabian KollhoffJörg Libuda
Feb 19, 2019·Nanoscale·Anna ŠutkaAndris Šutka
Sep 4, 2009·Analytical and Bioanalytical Chemistry·Hitoshi Watarai, Kenta Adachi
Apr 11, 2009·Journal of the American Chemical Society·Alexander RissOliver Diwald
Nov 23, 2011·Journal of the American Chemical Society·Ana StevanovicJohn T Yates
May 23, 2017·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Anton LitkeJan P Hofmann
Apr 18, 2018·ACS Applied Materials & Interfaces·Johannes SchneiderOliver Diwald
Feb 15, 2007·Nano Letters·Alexander RissErich Knözinger

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