State Key Laboratory of Structures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
Anal Chim Acta. 2015 Aug 5;887:59-66. doi: 10.1016/j.aca.2015.05.051. Epub 2015 Jul 8.
A ruthenium-mediated photoelectrochemical sensor was developed for the detection of BPA, using molecularly imprinted polymers (MIPs) as the recognition element, a tin oxide (SnO2) nanoparticle-modified ITO as the electrode, and a blue 473-nm LED as the excitation light source. Photoelectrochemical oxidation of BPA on SnO2 electrode was achieved by Ru(bpy)3 under the irradiation of light. It was found that BPA was oxidized by Ru(3+) species produced in the photoelectrochemical reaction, resulting in the regeneration of Ru(2+) and the concomitant photocurrent enhancement. MIPs film was prepared by electropolymerization of pyrrole on SnO2 electrode using BPA as the template. Surface morphology and properties of the as-prepared electrode were characterized by SEM, electrochemical impedance spectroscopy, and photocurrent measurement. In the presence of BPA, an enhanced photocurrent was observed, which was dependent on the amount of BPA captured on the electrode. A detection limit of 1.2 nM was obtained under the optimized conditions, with a linear range of 2-500 nM. Selectivity of the sensor was demonstrated by measuring five BPA analogs. To verify its practicality, this sensor was applied to analyze BPA spiked tap water and river water. With advantages of high sensitivity and selectivity, low-cost instrument, and facile sensor preparation procedure, this sensor is potentially suitable for the rapid monitoring of BPA in real environmental samples. Moreover, the configuration of this sensor is universal and can be extended to organic molecules that can be photoelectrochemically oxidized by Ru(3+).
一种基于钌（Ru）介导的光电化学传感器被开发出来，用于检测双酚 A（BPA），其识别元件为分子印迹聚合物（MIPs），电极采用氧化锡（SnO2）纳米粒子修饰的 ITO，激发光源为蓝色 473nm LED。在光的照射下，[Ru（bpy）3]（2+）使 BPA 在 SnO2 电极上发生光电化学氧化。研究发现，BPA 被光电化学反应中产生的 Ru（3+）物种氧化，导致 Ru（2+）的再生和伴随的光电流增强。MIPs 膜通过在 SnO2 电极上电聚合吡咯，以 BPA 为模板制备而成。采用扫描电子显微镜（SEM）、电化学阻抗谱（EIS）和光电流测量对制备电极的表面形貌和性能进行了表征。在存在 BPA 的情况下，观察到光电流增强，这与电极上捕获的 BPA 量有关。在优化条件下，检测限为 1.2 nM，线性范围为 2-500 nM。通过测量五种 BPA 类似物，证明了传感器的选择性。为了验证其实际应用，该传感器被用于分析加标自来水和河水样品中的 BPA。由于该传感器具有灵敏度高、选择性好、仪器成本低以及传感器制备过程简单等优点，有望用于实际环境样品中 BPA 的快速监测。此外，该传感器的配置具有通用性，可扩展到可被 Ru（3+）光电氧化的有机分子。
