| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1524570 | Materials Chemistry and Physics | 2011 | 7 Pages |
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 °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 °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.
Graphical abstractA thermal annealing procedure was described for fine modifying the photonic bandgap properties of colloidal photonic crystals, which were self-assembled from vinyl-functionalized silica spheres by a gravity sedimentation process.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We described a thermal annealing procedure for fine modifying the photonic bandgap properties of colloidal photonic crystals. ► The position of its stop band had more than 25% blue shift by annealing the sample from 60 to 600 ̊C. ► The annealing temperature and the Bragg peak values have a linear relationship in the 120-440 ̊C range. ► The effects provide a simple and controllable method for modifying the photonic bandgap properties of colloidal photonic crystals.
