基于海藻酸钠电沉积技术制备ZnO量子点及其复合膜的检测应用研究  

Preparation of ZnO Quantum Dots and Composite Films Based on Sodium Alginate Electrodeposition and Applications on Detection

作　　者：刘俊 夏传杰 王康龙 李端明 王清华 周俊杰 陶青 王艺峰[1] Jun Liu;Chuan-jie Xia;Kang-longWang;Duan-ming Li;Qing-huaWang;Jun-jie Zhou;Qing Tao;Yi-fengWang(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070)

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《高分子学报》2022年第2期145-152,共8页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号51873167);国家级大学生创新创业训练计划(项目号S202110497027)资助项目.

摘　　要：天然高分子电沉积技术为构建新型功能材料和器件提供了契机.ZnO量子点(QDs)具备无毒、荧光稳定等特点日益受到人们的重视.本工作基于天然高分子海藻酸钠的配位电沉积技术制备ZnO QDs及其纳米复合膜;所采用方法具备操作简单、易于控制、条件温和、绿色环保等优点;并且产物后处理简便,可以直接在电极上构建出ZnO QDs/海藻酸钠复合膜.测试结果表明复合膜中存在大小均一的ZnO QDs,平均粒径为6 nm.复合膜的外观均一平整,呈现明显的橙色荧光.ZnO QDs/海藻酸钠复合膜不仅对K3[Fe(CN)6]具有电化学检测作用,而且对Cu2+具有荧光检测作用.本工作为ZnO QDs的制备以及QDs/天然高分子纳米复合材料的构建提供一种新方法,所制得的复合膜在电化学检测和荧光检测领域具有应用价值.Electrodeposition of biopolymer shows attractive development on fabricating novel functional materials and devices.ZnO quantum dots(QDs)have drawn increasing attention due to their environmentally friendly and non-toxic features,and good fluorescence properties.This work develops a method based on the coordination electrodeposition of sodium alginate to prepare ZnO QDs and ZnO QDs/sodium alginate nanocomposite films on electrodes.The method has many advantages such as the simple operation,the mild condition,the good controllability and the environmentally friendly process.Moreover,it allows a facile post treatment for products to directly obtain the nanocomposite films of QDs and biopolymer on electrodes.In the method,sodium alginate was not only used as the electrodeposition biopolymer,but also served as the stabilizing agent for preparing ZnO QDs as well as the main ingredient in the resulting nanocomposite film.TEM observation shows that there are nanoparticles with a relatively uniform size in the nanocomposite film,and that the average size of these nanoparticles is 6.0 nm.The ZnO QDs/sodium alginate nanocomposite film shows a clear orange fluorescence under 365 nm UV light.The UV-Vis spectrum of the nanocomposite film has a clear absorption peak at 340 nm,which is attributed to the typical absorption peak of ZnO QDs.The photoluminescence spectrum of the nanocomposite film shows a clear emission peak at 550 nm,which agrees with the emission peak of ZnO QDs.The above spectral data both prove that there are ZnO QDs in the nanocomposite film.Furthermore,the ZnO QDs/sodium alginate nanocomposite film on the electrode can be applied to conduct electrochemical detection of K3[Fe(CN)6]with a detection limit of 2.64μmol/L.By taking advantage of the fluorescence properties,the ZnO QDs/sodium alginate nanocomposite film can be used for fluorescence detection of Cu^(2+)ions.Therefore,this work provides a novel method for the preparation of ZnO QDs and construction of QDs/biopolymer nanocomposite films.The resulting Zn

关 键 词：电沉积 海藻酸钠 ZnO量子点 纳米复合膜 检测 

分 类 号：O652[理学—分析化学] TB383[理学—化学]