Temperature-modified photonic bandgap in colloidal photonic crystals fabricated by vinyl functionalized silica spheres

被引：16
|
作者：
Deng, Tian-Song [1 ]
Zhang, Jun-Yan [1 ]
Zhu, Kong-Tao [1 ]
Zhang, Qi-Feng [1 ]
Wu, Jin-Lei [1 ]
机构：
[1] Peking Univ, Dept Elect, Key Lab Phys & Chem Nanodevices, Beijing 100871, Peoples R China
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2011年 / 129卷 / 1-2期
关键词：
Colloidal photonic crystals; Photonic bandgap; Silica spheres; Thermal annealing; STOP BANDS; FILMS; REFLECTION; HYDROGEL; COLOR;
D O I：
10.1016/j.matchemphys.2011.04.064
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A thermal annealing procedure for fine modifying the photonic bandgap properties of colloidal photonic crystals was described. The colloidal photonic crystals were assembled from monodisperse vinyl functionalized silica spheres by a gravity sedimentation process. The samples diffract light following Bragg's law combined with Snell's law. By annealing the sample at temperatures in the range of 60-600 degrees C, the position of its stop band shifted from 943 to 706 nm. It had more than 25% blue shift. In addition, the annealing temperature and the Bragg peak values have a linear relationship in the 120-440 degrees C range. Fourier transform infrared (FT-IR) spectra and thermo-gravimetric analysis (TGA) curves of vinyl functionalized silica spheres confirmed the above results. The effects provide a simple and controllable method for modifying the photonic bandgap properties of colloidal photonic crystals. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：540 / 546
页数：7
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