20 November 2012 Optical properties of azo-chromophore attached on the surface of a silica photonic crystal
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Optical properties of a azo-dye attached on the surface of the monodisperse silica photonic crystal have been investigated. The azo-chromophore was covalently attached to a 3-isocyanatopropyl triethoxysilane (ICPTES) having isocynate functional group by a urethane bond formation reaction. The resulting disperse red/ICPTES (DRICP) was attached on the surface of the silica photonic crystal by hydrolysis and condensation reactions. The FTIR spectrum of the resulting product DRICP/silica sphere (DRICPSS) shows no characteristic isocynate absorption peak at 2270 cm-1 and shows a new absorption peat at 1700 cm-1 corresponding the C=O stretching vibration. This result indicates the complete reaction between –N=C=O and –OH. The DRICPSS has weak brownish color when it is dried. The color of the DRICPSS changed to intense red when it is wetted in methanol, ethanol and 2-propanol. The near infrared absorption maximum at 788 nm shifted to 718 nm for the ICPDRSS after wetting in methanol. This system can be applicable to a sensitive alcohol sensor.
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Byoung-Ju Kim, Kwang-Sun Kang, "Optical properties of azo-chromophore attached on the surface of a silica photonic crystal", Proc. SPIE 8564, Nanophotonics and Micro/Nano Optics, 85640K (20 November 2012); doi: 10.1117/12.999810; https://doi.org/10.1117/12.999810

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