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1 results

  • Amplified Photochemistry with Slow Photons

  • Jennifer I. L. Chen, Georg von Freymann, Sung Yeun Choi, Vladimir Kitaev, Geoffrey A. Ozin
  • Journal:
    MRS Online Proceedings Library Archive / Volume 988 / 2006
    Published online by Cambridge University Press:
    26 February 2011, 0988-QQ09-05
    Print publication:
    2006

  • 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.