低温水相合成巯基化聚乙烯醇/CdS量子点纳米复合物及用于测定环境水样中痕量Cu(2＋)  

Aqueous Synthesis of Thiol-functionalized Polyvinylalcohol/CdS Quantum Dots Nanocomposite at Low Temperature for Detection of Trace Cu^(2+) in Water

作　　者：关晓琳[1] 贾天明[1] 秦雨欣[1] 张东海[1] 张扬[1] 范红婷 魏强兵[1] 来守军[2] 

机构地区：[1]西北师范大学化学化工学院,生态环境相关高分子材料教育部重点实验室,甘肃省高分子材料重点实验室,兰州730070 [2]兰州文理学院化工学院,兰州730000

出　　处：《应用化学》2017年第3期291-299,共9页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(51363019,21504070);高等学校博士学科点专项科研基金联合资助基金(20029838)资助~~

摘　　要：采用水相合成法,在低温N2气保护条件下,以巯基化聚乙烯醇(PVA)为基体材料合成一种环境友好型PVA/CdS量子点纳米复合物,并通过红外光谱(IR)、X射线粉末衍射(XRD)、透射电子显微镜(TEM)、热重(TG)、荧光光谱(PL)和紫外可见光谱(UV-Vis)等技术手段对复合物进行结构表征和光学性能研究。测试结果表明,复合物中CdS量子点为立方晶型结构,形状为球形,粒径小于5nm,具有很好的稳定性、分散性及发光性质。此外,Cu^(2+)对PVA/CdS水溶液荧光具有良好的猝灭作用,其荧光猝灭程度与Cu^(2+)浓度在1~1000nmol/L范围内呈良好的线性关系,线性相关系数为0.9923,方法检出限为0.12nmol/L。该纳米复合物荧光分析方法简便快速、灵敏度高、检出限低,已应用于实际黄河水样中痕量Cu^(2+)的分析与检测。A high quality PVA/CdS QDs nanocomposites modified by thiol-functionalized polyvinylalcohol （PVA） was prepared by aqueous synthetic approaches at low temperature. The samples were characterized by infrared spectroscopy （ IR ）, X-ray diffraction （ XRD ）, transmission electron microscopy （ TEM ）, thermogravimetric analysis （ TG）, photoluminescenee spectroscopy （PL） and ultraviolet-visible spectroscopy （UV-Vis）. The results show that CdS QDs in the nanocomposites are spherical particles with a cubic crystal structure and a diameter size of about 5 nm. PVA/CdS nanoeomposites have good stability, high dispersibility and excellent luminescence properties. Meanwhile, the fluorescent responses of as-prepared PVA/CdS to different metal ions were studied. Based on the fluorescence quenching behavior of PVA/CdS quantum dots, we established a method for the fluorescent detection of Cu2＋. When the concentration of Cu2＋ is in the range of 1 ~ 1000 nmol/L, the fluorescence intensity linearly decreases with the increase of Cu2＋ concentration, The linear correlation coefficient is 0. 9923 and the detection limit reaches 0. 12 nmol/L. The method provides high sensitivity, simplicity of operation and low detection limit, and is successfully applied to the determination of trace copper in the Yellow River samples.

关 键 词：CDS量子点 聚乙烯醇 纳米复合物 荧光检测 CU2+ 

分 类 号：O625[理学—有机化学]