A photoelectrochemical aptasensor for the sensitive detection of streptomycin based on a TiO2/BiOI/BiOBr heterostructure

• Published in: Analytica chimica acta Vol. 1115; pp. 33 - 40
• Main Authors: Luo, Yanni, Tan, Xuecai, Young, David J., Chen, Quanyou, Huang, Yuehui, Feng, Defen, Ai, Chenhao, Mi, Yan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 08-06-2020
• Subjects: Photoelectrochemical aptasensor; Streptomycin; TiO2/BiOI/BiOBr; Photoelectrochemical aptasensor; TiO2/BiOI/BiOBr; Streptomycin
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/j.aca.2020.04.021

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 BiOI/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.
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•A novel photoelectrochemical aptasensor based on a TiO2/BiOI/BiOBr heterostructure was designed.•The TiO2/BiOI/BiOBr shows high PEC photocurrent response and good stability.•The developed PEC aptasensor exhibites both of enhanced sensitivity and specificity.