A photoelectrochemical (PEC) aptasensor on basis of [Ru(bpy)₃]²⁺@Ce-UiO-66/Mn:Bi₂S₃ composites was constructed for detecting ofloxacin (OFL). First, Ce-UiO-66, prepared by a solvothermal method, had Zr⁴⁺–Zr³⁺ and Ce⁴⁺–Ce³⁺ intervalence cycles to increase the charge separation efficiency. Subsequently, Ce-UiO-66 was further modified by [Ru(bpy)₃]²⁺ and Mn:Bi₂S₃ cosensitization to improve the photoelectric activity. [Ru(bpy)₃]²⁺ not only broadened the range of light absorbed but also reacted with an electron donor to maintain the photoelectric conversion process. Among the [Ru(bpy)₃]²⁺@Ce-UiO-66/Mn:Bi₂S₃ heterojunction, Mn:Bi₂S₃ was a photosensitizer, which maximized the efficiency of the electron–hole separation and significantly improved photocurrent. Then, an aptamer was used as a biorecognition unit for OFL-specific detection. Under the best conditions, the PEC aptasensor realized the sensitive detection of OFL, with a detection range of 0.01–100 nmol/L and a detection limit of 6 pmol/L. In addition, the constructed PEC OFL sensor showed good reproducibility, stability, and specificity.

中文翻译：

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[Ru(bpy)3]2+@Ce-UiO-66/Mn:Bi2S3 异质结及其在氧氟沙星检测中的优异光电化学适配传感性能

构建了基于[Ru(bpy) ₃ ] ²⁺ @Ce-UiO-66/Mn:Bi ₂ S ₃复合材料的光电化学(PEC)适体传感器用于检测氧氟沙星(OFL)。首先，通过溶剂热法制备的Ce-UiO-66具有Zr ⁴⁺ -Zr ³⁺和Ce ⁴⁺ -Ce ³⁺间隔循环以提高电荷分离效率。随后，Ce-UiO-66通过[Ru(bpy) ₃ ] ²⁺和Mn:Bi ₂ S ₃共敏化进一步改性，以提高光电活性。[Ru(bpy) ₃ ] ²⁺不仅拓宽了光的吸收范围，而且还与电子供体反应以维持光电转换过程。在[Ru(bpy) ₃ ] ²⁺ @Ce-UiO-66/Mn:Bi ₂ S ₃异质结中，Mn:Bi ₂ S ₃是一种光敏剂，它最大限度地提高了电子-空穴分离的效率并显着提高了光电流. 然后，使用适体作为生物识别单元进行 OFL 特异性检测。在最佳条件下，PEC适体传感器实现了对OFL的灵敏检测，检测范围为0.01~100 nmol/L，检测限为6 pmol/L。此外，构建的PEC OFL传感器显示出良好的重现性、稳定性和特异性。