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A novel photoelectrochemical strategy for lead ion detection based on CdSe quantum dots co-sensitized ZnO-CdS nanostructure
Journal of Electroanalytical Chemistry ( IF 4.5 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.jelechem.2020.114828
Jun-Tao Cao , Xiao-Jing Liao , Yu-Ling Wang , Yan-Ming Liu

Abstract A novel photoelectrochemical (PEC) aptasensor for lead ion (Pb2+) detection was proposed on the basis of the CdSe quantum dots (QDs) co-sensitized ZnO-CdS nanostructure and the specificity of aptamer. The CdSe QDs-capped cDNA, as a signal enhancement element, could hybridize with the aptamer on the sensing platform to generate a CdSe/CdS/ZnO dual co-sensitized structure, realizing a great enhancement in photocurrent response. In the presence of Pb2+, the aptamer on the sensing interface specifically bound with the Pb2+ to form G-quadruplex structures, which greatly inhibit the hybridization between aptamer and CdSe QDs-cDNA, leading to a decrement of the photocurrent signal. As the concentration of Pb2+ increased, the photocurrent response showed a diminishing tendency. Under the optimized conditions, the fabricated PEC aptasensor exhibited a linear response between photocurrent variation and the logarithm of Pb2+ concentration in the scope of 1.0 × 10−9 M to 1.0 × 10−5 M with a detection limit of 3.4 × 10−10 M. Moreover, the aptasensor has been applied in the determination of Pb2+ in environmental water samples with the good selectivity.

中文翻译:

基于CdSe量子点共敏化ZnO-CdS纳米结构的铅离子检测新光电化学策略

摘要 基于CdSe 量子点(QDs) 共敏化ZnO-CdS 纳米结构和适体的特异性,提出了一种用于铅离子(Pb2+) 检测的新型光电化学(PEC) 适体传感器。CdSe QDs 加帽的 cDNA 作为信号增强元件,可以与传感平台上的适体杂交,产生 CdSe/CdS/ZnO 双共敏结构,实现光电流响应的极大增强。在Pb2+存在下,传感界面上的适配体与Pb2+特异性结合形成G-四链体结构,极大地抑制了适配体与CdSe QDs-cDNA的杂交,导致光电流信号减弱。随着Pb2+浓度的增加,光电流响应呈递减趋势。在优化条件下,
更新日期:2021-01-01
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