高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (9): 1866-1872.doi: 10.7503/cjcu20190106

• 分析化学 • 上一篇    下一篇

基于PbS QDs/TiO2 NPs构建新型谷胱甘肽光电化学传感器

郑姗1,刘洋1,陈飘飘1,邢怡晨1,黄朝表1,2,*()   

  1. 1. 浙江师范大学化学与生命科学学院, 金华 321004
    2. 浙江师范大学行知学院, 兰溪 321100
  • 收稿日期:2019-02-19 出版日期:2019-09-10 发布日期:2019-07-16
  • 通讯作者: 黄朝表 E-mail:hcb@zjnu.cn
  • 基金资助:
    国家自然科学基金(21575129)

Novel Glutathione Photoelectrochemical Sensor Based on PbS QDs/TiO2 NPs

ZHENG Shan1,LIU Yang1,CHEN Piaopiao1,XING Yichen1,HUANG Chaobiao1,2,*()   

  1. 1. College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China
    2. Xingzhi College, Zhejiang Normal University, Lanxi 321100, China
  • Received:2019-02-19 Online:2019-09-10 Published:2019-07-16
  • Contact: HUANG Chaobiao E-mail:hcb@zjnu.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21575129)

摘要:

通过高温煅烧将二氧化钛纳米颗粒(TiO2 NPs)修饰到ITO电极表面制成TiO2 NPs/ITO电极, 再采用连续离子层吸附反应(SILAR)循环将硫化铅量子点(PbS QDs)修饰到TiO2/ITO电极表面制得PbS QDs/TiO2 NPs/ITO电极, 并将该电极应用于检测谷胱甘肽(GSH)的光电化学传感器. 在该传感器中, 当PbS QDs受470 nm可见光的激发时将产生电子(e)和光生空穴(h +), 光生空穴可被溶液中的GSH捕获, 并将GSH氧化成GSSH, 有效避免电子和空穴的复合, 显著提高了光电效率. 该传感器对GSH的检测具有较高的灵敏度和选择性, 线性检测范围为0.06~1 mmol/L, 检出限(LOD)为4.6×10 -3 mmol/L(S/N=3).

关键词: 硫化铅量子点, 二氧化钛纳米颗粒, 谷胱甘肽, 光电化学, 生物传感器

Abstract:

Firstly, titanium dioxide nanoparticles(TiO2 NPs) was modified to the surface of indium tin oxide(ITO) electrode by high-temperature calcination to prepare TiO2 NPs/ITO electrode. And then sulfide quantum dots(PbS QDs) were modified to the surface of TiO2 NPs/ITO electrode by successive ionic layer adsorption and reaction(SILAR) cycle to prepare the PbS QDs/TiO2 NPs/ITO electrode. And it was used to detect glutathione(GSH). In this sensor, when PbS QDs are excited by 470 nm visible light, it will produce electrons(e) and holes(h +). Immediately after, h + will be captured by GSH in solution, and then GSH is oxidized into GSSH. Therefore, the recombination of electrons and holes were avoided effectively. Thus the photoelectric efficiency has been significantly improved. This sensor had satisfactory sensitivity and selectivity for GSH. what’s more, the detection range is 0.06—1 mmol/L, and the detection limit(LOD) is 4.6×10 -3 mmol/L(S/N=3).

Key words: PbS QDs, TiO2 NPs, Glutathione(GSH), Photoelectrochemical, Biosensor

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