期刊
BIOSENSORS & BIOELECTRONICS
卷 207, 期 -, 页码 -出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2022.114176
关键词
Antenna-like strategy; S doped-Bi2WO6; PEDOT; Self-powered; Cathodic photoelectrochemical; Biosensor
类别
资金
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2020jcyj-msxmX0386]
- National Natural Science Foundation of China [21501081]
In this study, an antenna-like strategy was developed to amplify the cathodic photocurrent of a photoelectrochemical (PEC) biosensor without using p-type semiconductors, resulting in improved sensitivity. The strategy involved using poly (3,4-ethyl-enedioxythiophene) (PEDOT) as the photocathode and n-type S doped-Bi2WO6 as the photoanode, allowing for amplified cathodic photocurrent and enhanced charge separation.
The sensitivity of cathodic photoelectrochemical (PEC) biosensor is mainly limited by the weak photocurrent response of p-type semiconductors due to the intrinsic weak hole conduction and severe charge recombination. Herein, we developed an antenna-like strategy that can amplify 10-fold of the cathodic photocurrent without using of p-type semiconductor. Specifically, poly (3,4-ethyl-enedioxythiophene) (PEDOT) was used as photocathode to improve the migration of photo-generated electrons (e(-)) from the n-type S doped-Bi2WO6 (Bi2WO6-xSx) photoanode through the external circuit and therefore an amplified cathodic photocurrent can be obtained toward such an antenna-like strategy. We further demonstrated that the antenna-like effect is originated from the super electrical conductivity of PEDOT photocathode and the facilitated charge separation of Bi2WO6-xSx photoanode by S doping. As a proof of concept, a self-powered dual-photoelectrode cathodic PEC biosensor driven by visible light was fabricated for microRNA-141 detection. Importantly, the biological recognition occurred at the photocathode could advance the anti-interference capability of the biosensor and show outstanding performance for microRNA-141 detection with a low limit of detection (LOD) of 0.3 fM. The antenna-like strategy offers a new method to amplify the cathodic photocurrent for sensitively PEC analysis.
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