Journal
ANALYTICA CHIMICA ACTA
Volume 1115, Issue -, Pages 33-40Publisher
ELSEVIER
DOI: 10.1016/j.aca.2020.04.021
Keywords
Photoelectrochemical aptasensor; TiO2/BiOI/BiOBr; Streptomycin
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Funding
- National Natural Science Foundation of China [21365004]
- Key Research and Development Project of Guangxi [AB18126048]
- Specific research project of Guangxi for research bases and talents [18126005 CE]
- Guangxi Natural Science Foundation [2013GXNSFDA019006, 2016GXNSFBA380201, 2018GXNSFAA138086]
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In photoelectrochemical sensor (PEC sensor), sensitivity and selectivity are two essential factors which are determined by photosensitive of materials and identification of elements. Herein, a novel PEC aptamer sensor for streptomycin-specific detection was developed, with which the visible-light-active TiO2/BiOI/BiOBr heterostructure and aptamers were employed as photoactive material and bio-identification elements, separately. The combination of an appropriate amount of TiO2 with BiOl/BiOBr enhanced the photocurrent response, and thus is beneficial to the construction of PEC sensors. In addition, the one-pot synthesis of TiO2/BiOI/BiOBr has the advantage of being environmentally-friendly. Under optimized conditions, the photocurrent response of aptamer/TiO2/BiOI/BiOBr/ITO is linear with SRT concentration from 0.05 to 150 nM, and the detection limit (S/N = 3) is as low as 0.04 nM. This novel PEC sensing strategy provided an ultra-sensitive sensor with high selectivity and stability for SRT detection. (C) 2020 Elsevier B.V. All rights reserved.
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