原位聚合法制备聚丙烯酸修饰的ZnS量子点  

In-situ polymerization approach for preparation polyacrylic acid coated ZnS quantum dots

作　　者：杨春风[1] 李勰 张颖鑫[1] 王婷婷[1] 王会[2] YANG Chunfeng;LI Xie;ZHANG Yingxin;WANG Tingting;WANG Hui(Department of Material and Chemical Engineering,Ningbo University of Technology,Ningbo 315211,China;Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China)

机构地区：[1]宁波工程学院材料与化学工程学院,宁波315211 [2]中国科学院上海高等研究所,上海201210

出　　处：《复合材料学报》2020年第9期2258-2264,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(21405085);宁波市自然科学基金(2017A6100232)。

摘　　要：采用原位聚合法对ZnS量子点表面进行聚丙烯酸(PAA)的修饰。利用XRD、FTIR、TEM、TGA、荧光测试等对ZnS@PAA复合纳米粒子进行系列表征。XRD分析表明,修饰后的ZnS仍为立方晶相。FTIR和TGA结果证明,ZnS纳米粒子表面存在PAA。TEM结果表明,修饰后ZnS@PAA复合纳米粒子在去离子水中分散良好,其直径有所增加,约为28 nm,且呈较明显的核-壳结构。荧光测试发现,修饰PAA前后ZnS@PAA复合纳米粒子的发光特性没有发生明显改变。实验表明,经PAA修饰后,ZnS@PAA复合纳米粒子在水溶液中的分散性和稳定性得到提高,抗氧化性和荧光稳定性也得到了一定的增强。The surface of ZnS quantum dots was modified with polyacrylic acid(PAA)by situ polymerization.The resulting ZnS@PAA composite nanoparticles were characterized by XRD,TEM,FTIR,TGA and fluorescence test.XRD results indicat that the ZnS@PAA composite nanoparticles exhibite a pure cubic phase.FTIR and TGA results reveal that the ZnS nano particles are coated with PAA.TEM results reveal that PAA coated ZnS quantum dots monodisperse and spherical shape in the water phase,the size of spherical particles is estimated to be 28 nm.The fluorescence tests show that after PAA coated,the fluorescent position and intensity of ZnS@PAA composite nanoparticles do not changed significantly.The test results display that PAA coated ZnS quantum dots have more favorable dispersion stability than that of the uncoated ones in aqueous system.The ZnS@PAA composite nanoparticles with excellen oxidation resistance,fluorescence stability,water-solubility and carboxyl-functionalization could be used for biological detection and bio-imaging.

关 键 词：ZNS 量子点 聚丙烯酸 原位聚合 表面修饰 水溶性高聚物 荧光性能 

分 类 号：TQ322[化学工程—合成树脂塑料工业]