Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
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Improving the optical properties of vinyl-functionalized silica colloidal crystals by thermal annealing
Tian-Song DENGJun-Yan ZHANGKong-Tao ZHUQi-Feng ZHANGJin-Lei WU
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2010 Volume 118 Issue 1382 Pages 862-866

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Abstract
Three-dimensional vinyl-functionalized silica colloidal crystals (VFS-CCs), which the attenuation of the photonic bandgap could be significantly improved by thermal annealing, were fabricated by a gravity sedimentation process using monodisperse vinyl-functionalized silica spheres. With the increase of the annealing temperature from 60 to 140°C, the attenuation of the bandgap had more than 40% increase. The SEM images and optical UV–vis–NIR spectra confirmed the high quality of the VFS-CCs. Fourier transform infrared (FT–IR) spectra and thermo-gravimetric analysis (TGA) of the vinyl-functionalized silica spheres demonstrated that the optimal annealing temperature of the VFS-CCs was about 120°C, slightly lower than the oxidation temperature of the vinyl groups. This work provides a simple and controllable method for fabricating and optimizing the optical properties of the surface-modified colloidal crystals.
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© 2010 The Ceramic Society of Japan
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