Due to its outstanding conductive properties, TiO-based heterojunctions have extensive applications in the field of photoelectrochemical sensors. However, due to surface energy and van der Waals forces, TiO tends to aggregate and presents an uneven distribution, which reduces the overall performance of these heterostructures. To overcome these challenges and achieve a uniform distribution of TiO within the heterojunction, the characteristic of gradual decomposition of the metal-organic framework MIL-125 under hydrothermal conditions was employed. This process gradually generates TiO particles that slowly participate in the construction of the heterojunction. By combining the exceptional light absorption properties and appropriate bandgap widths of CdS and CdInS, a uniformly distributed flower-globular ternary heterojunction CdS/CdInS/TiO-FG was successfully synthesized. In comparison to the disordered heterojunction CdS/CdInS/TiO-DO, CdS/CdInS/TiO-FG exhibits enhanced visible light absorption properties and photoelectric conversion efficiency. Taking Bisphenol A (BPA) as a model, a signal-off photoelectrochemical (PEC) aptasensor based on the CdS/CdInS/TiO-FG was established and exhibited a high sensitive detection for BPA with a linear response range from 10 to 10 pM, as well as an ultralow detection limit of 0.015 pM, revealing vivid selectivity, stability, and reproducibility. Therefore, this study offers an efficient and straightforward approach for the preparation of TiO-based heterojunctions with superior photoelectric activity.

中文翻译：

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利用 MIL-125 水热分解策略增强 TiO2 基异质结的光电性能，用于双酚 A 的灵敏检测

TiO基异质结由于其优异的导电性能，在光电化学传感器领域有着广泛的应用。然而，由于表面能和范德华力，TiO2容易聚集并呈现不均匀分布，从而降低了这些异质结构的整体性能。为了克服这些挑战并实现 TiO2 在异质结内的均匀分布，利用了金属有机骨架 MIL-125 在水热条件下逐渐分解的特性。这个过程逐渐产生 TiO2 颗粒，慢慢参与异质结的构建。通过结合CdS和CdInS优异的光吸收特性和适当的带隙宽度，成功合成了均匀分布的花球状三元异质结CdS/CdInS/TiO-FG。与无序异质结CdS/CdInS/TiO-DO相比，CdS/CdInS/TiO-FG表现出增强的可见光吸收性能和光电转换效率。以双酚A（BPA）为模型，建立了基于CdS/CdInS/TiO-FG的信号关闭光电化学（PEC）适体传感器，并表现出对BPA的高灵敏度检测，线性响应范围为10至10 pM，以及 0.015 pM 的超低检测限，展现出生动的选择性、稳定性和重现性。因此，本研究为制备具有优异光电活性的 TiO 基异质结提供了一种有效且直接的方法。