School of Chemistry and Chemical Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang, 212013, China.
Mikrochim Acta. 2021 Aug 5;188(9):289. doi: 10.1007/s00604-021-04952-5.
A photoelectrochemical (PEC) aptasensor was designed and constructed by BiOCl/BiOCl heterojunction as a photoelectric active material for realizing the determination of trace ciprofloxacin (CIP) in water. Compared with BiOCl, BiOCl/BiOCl heterojunction possessed the improvement of light harvesting and the enhancement of photocurrent signal. The formation of heterojunction between BiOCl and BiOCl can accelerate the transportation efficiency and inhibit the recombination rate of photoinduced carriers. Based on the excellent PEC performance, CIP aptamer was introduced on the modified BiOCl/BiOCl/indium tin oxide (ITO) electrode for fabricating a PEC aptasensor. Owing to the combination between aptamer and CIP, CIP-aptamer complex can block the transfer of charge, leading to the reduction of photocurrent response. The PEC aptasensor possessed high sensitivity with a wide detection range (5.0~1.0 × 10 ng L) and a low detection limit (1.67 ng L, S/N = 3). The PEC aptasensor with good selectivity and reproducibility has been applied to the determination of CIP in water.
光电化学（PEC）适体传感器是通过 BiOCl/BiOCl 异质结作为光电活性材料设计和构建的，用于实现水中痕量环丙沙星（CIP）的测定。与 BiOCl 相比，BiOCl/BiOCl 异质结具有提高的光捕获和增强的光电流信号。BiOCl 和 BiOCl 之间异质结的形成可以加速光生载流子的输运效率并抑制其复合速率。基于优异的 PEC 性能，将 CIP 适体引入修饰后的 BiOCl/BiOCl/氧化铟锡（ITO）电极上，以制备 PEC 适体传感器。由于适体与 CIP 的结合，CIP-适体复合物可以阻止电荷转移，导致光电流响应降低。PEC 适体传感器具有高灵敏度、宽检测范围（5.0~1.0×10 ng L）和低检测限（1.67 ng L，S/N=3）。该 PEC 适体传感器具有良好的选择性和重现性，已应用于水样中环丙沙星的测定。
