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Visible-light driven label-free photoelectrochemical immunosensor based on TiO /S-BiVO @Ag S nanocomposites for sensitive detection OTA.

Feng, Jinhui; Li, Yueyun; Gao, Zengqiang; Lv, Hui; Zhang, Xiaobo; Fan, Dawei; Wei, Qin.
Biosens Bioelectron; 99: 14-20, 2018 Jan 15.
Article in En | MEDLINE | ID: mdl-28732344

Abstract

A label-free photoelectrochemical (PEC) platform with high visible-light activity for quantitative detection of the ochratoxin A (OTA) was developed by assembly of Ag S nanoparticles (NPs) sensitized on titanium dioxide/red blood cell-like shape bismuth vanadate (TiO /S-BiVO ) electrode via layer-by-layer (LBL) strategy. In this protocol, ascorbic acid was used as an efficient electron donor for scavenging photo-generated holes and inhibiting light driven electron-hole pair recombination. TiO has good photoelectric activity and large surface area. The S-BiVO with porous structure surfaces can contribute to the high photocurrent intensity under visible-light irradiation. Moreover, the Ag S NPs were in-situ growth on surfaces of thioglycolic acid modified S-BiVO , which enhanced photocurrent response and further improved the photocurrent conversion efficiency. Under optimal conditions, the PEC immunosensor exhibited a wide linear concentration range from 5pgmL to 750ngmL , with a low detection limit of 1.7pgmL (S/N = 3) for OTA. Additionally, the designed immunosensor was performed with good stability, reproducibility and selectivity, thus opening up a new promising PEC platform for some other small molecules analysis.