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首先采用Stber方法制备了一系列亚微米级单分散二氧化硅小球,而后通过垂直沉降自组装方法制备了颜色鲜艳的二氧化硅三维有序结构胶体晶体模板,最后再采用模板聚合法在220 nm二氧化硅小球自组装的阵列间隙中共聚甲基丙烯酸和乙二醇二甲基丙烯酸酯,经氢氟酸刻蚀二氧化硅模板后得到多孔有序的反蛋白石光子晶体.当pH值从5升至8时,反蛋白石凝胶光子晶体的反射峰波长从514 nm移动至590 nm,颜色变化显著,从蓝绿色变成红色,突变点为pH=6.5,而且pH响应在100 s左右即可达到平衡.对交联剂用量的研究结果表明,随着交联剂乙二醇二甲基丙烯酸酯用量从4%增加到16%,光子晶体响应pH时的红移量减小.
Firstly, a series of submicron monodisperse silica spheres were prepared by Stöber method. Then three-dimensionally ordered silica colloidal crystal templates with different colors were prepared by vertical sedimentation and self assembly method. Finally, template polymerization The copolymerization of methacrylic acid and ethylene glycol dimethacrylate in the self-assembled array gap of 220 nm silica beads resulted in the porous ordered anti-opal photonic crystals obtained by hydrofluoric acid etching of the silica template. The peak wavelength of the inverse opal gel photonic crystal shifted from 514 nm to 590 nm when the pH was raised from 5 to 8, and the color changed significantly from blue-green to red with a pH of 6.5 for the point of mutation and a pH response of 100 s or so to balance.Research on the amount of cross-linking agent showed that with the cross-linking agent ethylene glycol dimethacrylate increased from 4% to 16%, the red shift of photonic crystal in response to pH decreased .