Herein, SiO2-photonic crystal/TiO2 composite film (STF) with multilayer structure was designed and fabricated via self-assembly method and spin coating method. The micro-morphology and optical properties of the STF were characterized by scanning electron microscope (SEM) and UV/Vis/NIR spectrophotometer respectively. The photocatalytic activity of the STF was tested via the degradation rate of rhodamine B. The characterization results indicate that the STF has a regular ordered structure when the amount of ammonia is 3 mL and the concentration of SiO2 suspension is 1%, and SiO2 can be effectively combined with TiO2, so the STF has the best photocatalytic performance. The double-layer SiO2-photonic crystal/TiO2 composite film (DSTF) was further prepared and compared with the single-layer SiO2-photonic crystal/TiO2 composite film (SSTF). The photocatalytic properties of the DSTF are better than that of the SSTF. Finally, the mechanism of STF with enhanced photocatalytic performance is discussed, indicating that photonic crystal can effectively enhance the utilization of light which are near the wavelength of the center band gap, and then improve the photocatalytic performance of the photocatalyst.

中文翻译：

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多层结构SiO2-TiO2薄膜的制备与研究：光子晶体对增强光催化性能的影响

在此，通过自组装法和旋涂法设计并制备了具有多层结构的SiO2-光子晶体/TiO2复合膜（STF）。STF的微观形貌和光学性能分别通过扫描电子显微镜（SEM）和UV/Vis/NIR分光光度计进行表征。通过对罗丹明 B 的降解率测试 STF 的光催化活性。表征结果表明，当氨量为 3 mL，SiO2 悬浮液浓度为 1% 时，STF 具有规则的有序结构，SiO2 可与 TiO2 有效结合，使 STF 具有最佳的光催化性能。进一步制备了双层SiO2-光子晶体/TiO2复合薄膜（DSTF），并与单层SiO2-光子晶体/TiO2复合薄膜（SSTF）进行了比较。DSTF的光催化性能优于SSTF。最后讨论了STF增强光催化性能的机理，表明光子晶体可以有效提高中心带隙波长附近光的利用率，进而提高光催化剂的光催化性能。