膽固醇液晶是一種一維的光子晶體並且存在著特殊的布拉格反射，由於液晶材料價格普遍較高，拓印的膽固醇液晶膜可以有效地降低成本並且仍然存在膽固醇液晶的光子晶體性質。本研究經由多次曝光聚合，拓印膽固醇液晶的結構，即使去除了膜內膽固醇液晶以及手性分子，拓印膜仍具有布拉格反射，並且可以在高溫下使用。拓印高分子膜由向列型液晶(HSG222000)、掌性分子(CB15)、雙官能基單體(BAHB)以及光起始劑(IRG184)所混合的膽固醇液晶，經由多次曝光聚合而成，光罩的透光區域曝光，每次曝光一小時，再經由一天在暗室中讓分子混合物，從光罩區域外圍擴散至光罩聚合區域；接著再進行下一次的一小時曝光，經由連續曝光七次製成，製得拓印高分子膜，使製備完成的高分子膜浸入在氯仿中，將沒有聚合的分子去除，膽固醇液晶拓印膜便能成功地獲得。藉由浸潤不同的有機溶劑，拓印的膽固醇液晶高分子膜會有不同的布拉格反射波長，在混合不同組成的雙溶劑系統中反射波長的紅移與藍移的現象可以被觀察到，經由實驗結果顯示，光子晶體的高分子膜可以被應用在溶劑組成的感測，而且可以重複多次的使用。進一步的，本研究也將具有化學感測功能的(Rhodamine)衍生單體導入膽固醇液晶拓印膜，並探討所製備拓印高分子膜在離子感測上的應用，結果發現拓印膜針對銅離子具有明顯的呈色反應。

Cholesteric liquid crystal (CLC) is a kind of one-dimensional photonics exhibiting Bragg reflection. To reduce cost, imprinting of cholesteric liquid crystal polymer film showing photonics was performed via multiple photopolymerization. The imprinted polymer matrices shows Bragg reflection in the absence of both a chiral dopant and anisotropic liquid crystals. Imprinted photonic polymer films were prepared by photopolymerization of the mixture of nematic LC (HSG22200), chiral dopant (CB15), bifunctional monomer, 4,4’-bis((6-acryloyloxy) hexyloxy)biphenyl (BHAB), and photoinitiator (Irgacure-184). The multiple imprinting was carried out via multiple processes of UV-irradiation and then kept in dark for diffusion of monomers from surrounding. After a few times of repeating of UV/dark cycles, the photonic imprinted films were prepared successfully. After completion of UV-polymerization, the residual liquid crystal mixture was then removed thoroughly by solvent treatment. While refilling of various isotropic solvents into the fabricated imprinted photonic film, significant peak shifts were observed. The results suggest that cholesteric liquid crystal imprinted films are available for the detection of solvents and the films are recyclable. Furthermore, Rhodamine derived monomer was introduced into cholesteric liquid crystal polymer film. The fabricated imprinted films show color change for the detection of cooper ion.

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