Utilizing the wettability of inverse opal hydrogels, we report a new strategy to construct photonic hydrogels with multiple types of reliable signals, such as non-wetting (transparent), image contrast (weak color) with shifts of diffraction maximum (bright color), developing optical sensors for multifunctional detection.
W. Hong, H. Li, X. Hu, B. Zhao, F. Zhang and D. Zhang, Chem. Commun., 2012, 48, 4609 DOI: 10.1039/C2CC30927K
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