The rational construction of semiconductor heterojunctions with abundant active specific area and matched energy band alignment is vital to boosting photocurrent response in highly sensitive photoelectrochemical (PEC) sensors. Here, a molecularly imprinted PEC sensor is proposed based on a WO₃/BiVO₄ heterojunction using CAU-17, a Bi-based metal-organic framework (MOF), as a structural control agent. Unlike the conventional embedding structure, in which WO₃ is covered by BiVO₄ or vice versa, this MOF-derived WO₃/BiVO₄ hybrid comprises WO₃ nanoleaves and uniformly distributed BiVO₄ nanoparticles. This structure offers a comparatively large surface area, enhancing light adsorption and enhancing solid-solid and solid-liquid interfacial contact, thereby promoting photogenerated electron-hole separation, rapid charge transfer, and interfacial reaction. With the aid of molecular imprinting technology, the WO₃/BiVO₄-based PEC sensor is capable of quantitatively detecting amoxicillin, a frequently prescribed antibiotic in both human and veterinary medicine. This sensor exhibits broad linear range of 10⁻³–10³ μmol L⁻¹, low detection limit of 2.4 × 10⁻⁴ μmol L⁻¹, high specificity, reproducibility, and stability. Furthermore, it has significant practical potential for environmental pollution monitoring.

中文翻译：

---

基于 MOF（CAU-17） 衍生的 WO3 纳米叶/BiVO4 纳米颗粒异质结的高灵敏度光电化学传感器检测阿莫西林


具有丰富有效比面积和匹配能带对准的半导体异质结的合理构建对于提高高灵敏度光电化学 （PEC） 传感器的光电流响应至关重要。在这里，提出了一种基于 WO₃/BiVO₄ 异质结的分子印迹 PEC 传感器，使用 CAU-17（一种基于 Bi 的金属有机框架 （MOF）作为结构控制剂。与常规包埋结构不同，WO₃ 被 BiVO₄ 覆盖，反之亦然，这种 MOF 衍生的 WO₃/BiVO₄ 杂化物由 WO₃ 纳米叶和均匀分布的 BiVO₄ 纳米颗粒组成。这种结构提供了相对较大的表面积，增强了光吸附并增强了固-固和固-液界面接触，从而促进了光生电子-空穴分离、快速电荷转移和界面反应。借助分子印迹技术，基于 WO₃/BiVO₄ 的 PEC 传感器能够定量检测阿莫西林，阿莫西林是人类和兽医学中常用的抗生素。该传感器具有 ^{10-3-10 3} μmol ^L-1 的宽线性范围、2.4 × ^10-4 μmol ^L-1 的低检测限、高特异性、重现性和稳定性。此外，它在环境污染监测方面具有巨大的实际潜力。