传感技术学报2017，Vol.30Issue(7)：991-995,5.DOI:10.3969/j.issn.1004-1699.2017.07.003
基于CdTe量子点-壳聚糖-石墨烯纳米复合物构建亚硝酸盐电化学传感器
ElectrochemicalNitrite Sensor Based on CdTe Quantum Dots-Chitosan-Graphene Nanocompositemodified Glassy Carbon Electrode
摘要
Abstract
A new sensitive and selective electrochemical nitrite sensor based on CdTe quantum dots-chitosan-graphene(Gr-CS-CdTe)nanocomposite modified glassy carbon electrode via electrostatic self-assembly strategy was fabricated.Herein,the negatively charged Gr dispersed in CS to form a stable film with the ability of enhancing electronic transport,simultaneously,the negative charged thioglycollic acid(TGA)capped CdTe QDs attached to positively charged CS,and polyvinyl pyrrolidone(PVP)was as the stabilizer coated on the outside layer.The sensor was characterized by its electrochemical behavior and it was showed that the oxidative peak of nitrite was largely enhanced and therefore the sensitively of the sensor was improved due to the very small size,high electron-transfer efficiency,large specific surface area of CdTe QDs.The proposed sensor combined with differential pulse voltammetry was applied in the determination of nitrite in pickled vegetable samples.The results showed that external standard calibration curve was linear in the range of 2 μmol/L~100 μmol/L with a detection limit of 0.89 μmol/L.The method was accurate with the recoveries ranged from 96.7 to 101.8%.关键词
电化学传感器/亚硝酸盐/静电自组装/CdTe量子点Key words
electrochemical sensor/nitrite/electrostatic self-assembly/CdTe QDs分类
信息技术与安全科学引用本文复制引用
胡杰,郭锋,侯娇娇,葛晓阳,王丽..基于CdTe量子点-壳聚糖-石墨烯纳米复合物构建亚硝酸盐电化学传感器[J].传感技术学报,2017,30(7):991-995,5.基金项目
浙江省自然科学基金项目(LY17C 200002) （LY17C 200002）
浙江省现代食品安全与营养协同创新中心项目(2017SICR113) （2017SICR113）
