背景:这项研究提出了一种用于基于CdS半导体膜的离子选择性电极(ISE)的新型光电化学(PEC)转换方法。动机源于需要提高各种分析应用的ISE的灵敏度和精度。
结果:我们通过水热法在FTO导电玻璃上合成了CdS薄膜,并将该电极用作工作电极。在可见光照射下,CdS产生的光电流与其在〜0.80V的大电势窗口内施加的电压成正比。抗坏血酸(AA)有效地抑制了电子-空穴络合,增强光电流稳定性。来自作为参比电极的ISE的电势调制进一步调节了光电流的产生,对宽范围的离子浓度表现出优异的灵敏度和线性度。通过检测血清钙水平验证了该方法的有效性。与传统的ISEs电位法和ICP-OES方法一致。
结论:这种光电化学转换策略为灵敏和准确的离子检测提供了一种有前途的方法,在临床诊断和环境监测中具有潜在的应用。
BACKGROUND: This study presents a novel photoelectrochemical (PEC) conversion method for ion-selective electrodes (ISEs) based on CdS semiconductor film. The motivation stems from the need to enhance the sensitivity and precision of ISEs for various analytical applications.
RESULTS: We synthesized CdS film on FTO conductive glass via a hydrothermal method and utilized this electrode as the working electrode. Under visible light irradiation, CdS generated photocurrent that is proportional to its applied voltage within a large potential window of ∼0.80 V. Ascorbic acid (AA) effectively inhibited electron-hole complexation, enhancing photocurrent stability. Potential modulation from ISEs acting as the reference electrode further regulated photocurrent generation, demonstrating excellent sensitivity and linearity for a wide range of ion concentrations. The method was validated by detecting serum calcium levels, showing agreement with traditional ISEs potentiometry and ICP-OES methods.
CONCLUSIONS: This photoelectrochemical conversion strategy offers a promising approach for sensitive and accurate ion detection, with potential applications in clinical diagnostics and environmental monitoring.