Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 60: Poster II: Optical Properties, incl. Photonic Crystals and Ultrafast Phenomena

HL 60.13: Poster

Thursday, March 25, 2010, 18:00–20:00, Poster D1

Macroscopically Homogeneous Inverse Opal Films — •Parvin Sharifi Rajabi and Frank Marlow — Max-Planck-Institut für Kohlenforschung, Mülheim (Ruhr), Germany

Slow photons are states with low group velocity in the photonic crystals. They exist at energies just above and below the photonic stop bands. These states can be used for enhancing chemical reactions of photocatalysts in photonic crystal shape. Then the material structure on the sub-micrometer scale manipulates the light propagation and influences the photochemical reaction rate. For fabricating the microstructured photocatalyst, polystyrene opal films [1] were used as templates for titania inverse opals. The capillary deposition method (CDM) was used for the opal film preparation [2] and the titania was synthesized in a sol-gel process also inside thin capillary cells. Macroscopically homogeneous titania inverse opal films with visible opalescence were successfully prepared. The influence of inverse opal structure on the optical properties and photochemical activity of these films is investigated.

[1] F. Marlow, Muldarisnur, P. Sharifi, R. Brinkmann, C. Mendive, Angew. Chem. Int. Ed. 2009, 48, 6212.

[2] H. L. Li, W. Dong, H. J. Bongard, F. Marlow, J. Phys. Chem. B 2005, 109, 9939.