高灵敏比色检测Cu2＋的反蛋白石结构光子晶体水凝胶膜

Highly Sensitive Colorimetric Sensing for Cu^(2+) by Inverse Opals of Photonic Crystal Hydrogels

以丙烯酰胺(AM)和N-乙烯基咪唑(NVI)为双功能单体,借助"三明治"结构有效控制前驱液的填充,制备了可特异性识别Cu^(2+)的反蛋白石结构光子晶体水凝胶膜(PCHs).该PCHs具有相互贯通的三维有序大孔结构,可在Cu^(2+)缓冲溶液中快速响应,产生特征的布拉格(Bragg)衍射峰.随着Cu^(2+)浓度的增大(0~10-4mol/L),PCHs的Bragg衍射峰位移66 nm,并伴随着明显的颜色变化(由棕红色逐渐变为黄绿色).此外,PCHs在混合金属盐溶液中仍能实现对Cu^(2+)的特异性识别.PCHs对Cu^(2+)的特异识别性、快速响应及自表达的特点为Cu^(2+)现场快速检测提供了可能.

Inverse opals of photonic crystal hydrogels（PCHs） composed of acrylamide（AM） and N-vinyl imidazole（NVI） copolymers were fabricated for the specific detection of Cu^（2＋）. A ＂sandwich＂structure was used to control the precursor infiltration in order to endow PCHs with highly ordered three-dimensional interconnected macroporous structure. The acquired PCHs produced the characteristic Bragg diffraction peak when immersed into Cu^（2＋） buffers,and exhibited a rapid response. With the increase of concentration of Cu^（2＋）from 0 mol/L to 10-4 mol/L,Bragg diffraction peak of PCHs blueshifted 66 nm and the color change was visible to the naked eyes（from brown to kelly green）. Furthermore,PCHs exhibited efficient recognition to Cu^（2＋） in the multicomponent metal ion solution. Such a specific recognition,rapid response and signal self-reporting of PCHs to Cu^（2＋） provide great potential for the real-time monitor of Cu^（2＋）.