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Hydrogel Improved the Response in the Titania/Graphene Oxide One-Dimensional Photonic Crystals

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posted on 2014-10-08, 00:00 authored by Chong Yao, Jiaoyu Ren, Cihui Liu, Tao Yin, Yanxi Zhu, Liqin Ge
Recently, one-dimensional photonic crystals (1DPCs) have attracted considerable interest because they exhibit a material-specific response profile to external stimuli. In our previous work, TiO2/GO 1DPCs, the stopbands of which can be made to span the whole visible range, were fabricated by spin-coating technique. The prepared 1DPCs have a double response to both dimethyl sulfoxide and alkali solution. However, the response is slow, insensitive, and irreversible. To improve the responsiveness of the 1DPCs, poly­(ethylene glycol) (PEG)-cross-linked poly­((methyl vinyl ether)-co-maleic acid) (PMVE-co-MA) hydrogels were embedded in those crystals. The results demonstrated that modified 1DPCs with different stopbands could be obtained by controlling the speed of the spin-coating technique. The prepared 1DPCs have better responsiveness to external solution pH.

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