A photoelectrochemical aptasensor for the sensitive detection of streptomycin based on a TiO2/BiOI/BiOBr heterostructure
| Autor: | Defen Feng, Quanyou Chen, Yuehui Huang, Xuecai Tan, Yanni Luo, David J. Young, Chenhao Ai, Yan Mi |
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| Rok vydání: | 2020 |
| Předmět: |
Photocurrent
Detection limit Chemistry business.industry Aptamer 010401 analytical chemistry High selectivity Heterojunction 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry 0104 chemical sciences Analytical Chemistry Environmental Chemistry Optoelectronics 0210 nano-technology Selectivity business Spectroscopy |
| Zdroj: | Analytica Chimica Acta. 1115:33-40 |
| ISSN: | 0003-2670 |
| DOI: | 10.1016/j.aca.2020.04.021 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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