一种基于ZnO量子点的荧光毛细管传感器检测有机溶剂中水含量

A ZnO quantum dots-based fluorescent sensor with capillary tubes for the detection of water content in organic solvents

该文利用高浓度3-氨基丙基三乙氧基硅烷（APTES）包覆ZnO量子点,成功制备出对水超敏感的纳米ZnO@APTES高荧光复合材料,进而将之修饰到毛细管内壁,借助毛细现象自动吸取待测样品,实现了对有机溶剂中水含量分析。以乙醇中的水含量分析为例,在最佳条件下,通过测定不同水量引起的毛细管壁上ZnO量子点的荧光猝灭率的变化,获知试剂中水含量,测得其线性检测范围为5.0%~30%。

In this paper, ZnO quantum dots were encapsulated into 3-aminopropyl-triethoxysilane （APTES） with high concentrations, resulting in the ZnO@APTES nanocomposites with high fluorescence and high sensitivity to wa- ter. The resulted nanocomposites were coated onto the inner surface of capillary tubes as the detection platform to- ward the detection of H20 content in organic solvents, where the sample solutions were automatically sucked into the capillary tubes by the capillarity. The ZnO fluorescence of ZnO@APTES could be dramatically quenched by water, of which the fluorescent quenching efficiencies could depend on the water levels in organic solvents. A ZnO@APTES-based fluorimetric method with capillary tubes was thus developed for the detection of water in ethanol as a solvent example. Under the optimal experimental conditions, the determination of water contents could be realized in the linear range of 5.0%-30%.