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Amplified Photochemistry with Slow Photons

Published online by Cambridge University Press:  26 February 2011

Jennifer I. L. Chen ,
Georg von Freymann ,
Sung Yeun Choi ,
Vladimir Kitaev  and
Geoffrey A. Ozin
Jennifer I. L. Chen
Affiliation:
[email protected], University of Toronto, Chemistry, 80 St. George Street, Toronto, M5S3H6, Canada
Georg von Freymann
Affiliation:
[email protected], Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft, Institut für Nanotechnologie, Karlsruhe, 76021, Germany
Sung Yeun Choi
Affiliation:
[email protected], University of Toronto, Chemistry, 80 St. George Street, Toronto, M5S 3H6, Canada
Vladimir Kitaev
Affiliation:
[email protected], Wilfrid Laurier University, Chemistry, Waterloo, N2L 3C5, Canada
Geoffrey A. Ozin
Affiliation:
[email protected], University of Toronto, Chemistry, 80 St. George Street, Toronto, M5S 3H6, Canada
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Abstract

We demonstrate monochromatic and white light optical amplification of the photo-oxidation of adsorbed methylene blue using an inverse colloidal photonic crystal fashioned from anatase nanocrystals, denoted i-nc-TiO2-o. Enhanced photo-activity that drives the oxidation of the dye is attributed to slow photons in i-nc-TiO2-o. When the slow photon wavelength is optimized with respect to the electronic excitation energy of i-nc-TiO2-o, the photo-oxidation rate of the dye is doubled compared to conventional nc-TiO2. By increasing the probability of absorbing photons in i-nc-TiO2-o relative to nc-TiO2, a larger population of electron-hole pairs is generated enabling more efficient photo-oxidation. Slow photons in photonic crystals portend a myriad of opportunities for amplified photo-processes in chemistry and biology.

Keywords

photochemicaloptical propertiesoxide
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 988: Symposium QQ – Solid-State Chemistry of Inorganic Materials VI , 2006 , 0988-QQ09-05
Copyright
Copyright © Materials Research Society 2007

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References

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