Chemically Responsive Polymer Inverse-Opal Photonic Crystal Films Created by a Self-Assembly Method

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• 作者：Huilin Zhao ; Jianping Gao ; Zeng Pan ; Guanbo Huang ; Xiaoyang Xu ; Yahui Song ; Ruinan Xue ; Wei Hong ; Haixia Qiu
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：June 9, 2016
• 年：2016
• 卷：120
• 期：22
• 页码：11938-11946
• 全文大小：637K
• 年卷期：0
• ISSN：1932-7455

文摘

The synthesis of poly-2-hydroxyethyl methacrylate inverse-opal hydrogel (IOHG_PHEMA) was realized by capillary-force-induced in situ polymerization in a polystyrene colloidal crystal template. The created IOHG_PHEMA films show brilliant blue-violet color when they are immersed in deionized water and reach swelling equilibrium. The stop band of the IOHG_PHEMA films can be tuned within the entire visible wavelength range by immersing them into different chemical solutions, such as aldehydes, ketones, amides, dimethyl sulfoxide, and alcohols. The extent of the reflective peak shift not only depends on the number of hydrogen band donors but also on the chain length and structure of the chemicals and their concentration. Since the IOHG_PHEMA films have different reflectance spectra and structural colors in response to different compounds of the same series, this provides a potential way to visually detect homologues and other compounds with similar structure and properties. This simple, yet effective, method also has the potential to be used generically to determine approximate concentration of the solution by direct visual observation of the color change.