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A facile approach for constructing molecularly imprinted photonic hydrogels with highly ordered and crack-free inverse-opal structure

Yang Zhaokun,Yu Zhangyong,Zhang Tao,Shi Dongjian,Qin Liyan,Liu Shirong,Chen Mingqing

Inverse opal of molecularly imprinted photonic hydrogels (MIPHs) represents an important colorimetric sensing platform, where the order and connectivity of inverse-opal structure is critical. However, MIPHs constructed by conventional approaches generally bear many cracks and merely presents order in short range. Herein, we report a facile approach to overcome these challenges by integrating evaporative co-deposition of colloids suspended within a hydrogel precursor and polymerization of monomers in single step. Co-deposition of colloids, imprinted molecules, and polymeric monomers as well as concurrent polymerization is firstly studied in detail. As-prepared inverse opal of MIPHs presents high order in long range and almost no crack. Different parameters affecting sensing performance were optimized in detail. MIPHs present high selectivity, sensitivity, and rapid response due to highly ordered inverse-opal structure and molecular recognition sites which are situated either at surface or in proximity to surface. Additionally, a mathematic relationship between Bragg diffraction wavelength shift of MIPHs and analyte concentration is proposed, enabling that MIPHs can not only be used in qualitative detection by visually perceptible color, but could quantitatively infer analyte concentration based on fitted equation. This work would provide an important inspiration for future construction of molecularly imprinted photonic hydrogels.