期刊
BIOSENSORS & BIOELECTRONICS
卷 117, 期 -, 页码 224-231出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2018.06.007
关键词
Photoelectrochemical aptasensor; TiO2 nanospheres; CuS nanoparticles; CuS-TiO2 heterojunction; Microcystin-LR
类别
资金
- National Natural Science Foundation of China [U1504215, 21576071, 21776061]
- International Science and Technology Cooperative Project - Department of Science and Technology of Henan Province [172102410042]
In this work, a CuS-TiO2 heterojunction composite was prepared by dispersedly depositing CuS nanoparticles on TiO2 nanospheres surface with a hydrothermal method, and was then used to construct a photoelectrochemical (PEC) aptasensor for sensitive detection of microcystin-LR (MC-LR) in aquatic environment. The energy bands of CuS nanoparticles and spherical anatase TiO2 were well matched, which enhanced the photo-to-current conversion efficiency. The composite exhibited the enhanced visible light absorption, the improved separation of photo-generated charges, and the reduced self-aggregation of CuS nanoparticles, leading to the enhanced photocurrent response. The PEC aptasensor was constructed by immobilizing CuS-TiO2 composite on ITO electrode with chitosan film that further covalently bound aminated aptamer. After the target, microcystin-LR (MC-LR) as an analyte model, was captured by the aptamer on the aptasensor, it could be oxidized by the photo generated hole to impede the electron-hole recombination and further amplify the photocurrent. The PEC aptasensor showed superior analytical performance for MC-LR with a linear range of 5.0 x 10(-5) nM to 250 nM and a detection limit of 2.0 x 10(-5) nM. The detection results with the aptasensor for practical water samples indicated its promising application in environmental monitoring.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据