Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei Province, PR China.
Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei Province, PR China.
Talanta. 2018 Aug 15;186:459-466. doi: 10.1016/j.talanta.2018.04.063. Epub 2018 Apr 22.
Tremella-like ZnInS (ZISt) and flower-like microsphere ZnInS (ZISm) were synthesized via a straightforward hydrothermal method. It was found that the ZISt was superior to ZISm for photoelectrochemical (PEC) sensing because of its large surface area and high photocatalytic activity. A composite of ZISt and graphene (GR) was prepared and used for the PEC sensing of dopamine (DA). Here DA acted as an electron donor to scavenge the hole and inhibit the charge recombination. The GR enhanced visible light absorption and accelerated electron transfer, amplifying the photocurrent signal. The strong chelating coordination interaction between DA and Zn(II) in ZISt guaranteed the selective adsorption of target analyte. Thus the resulting ZISt/GR photoelectrode showed sensitive and selective PEC response to DA. Under the optimized conditions, the linear response range was from 0.01 to 20 μM, and the detection limit was down to 0.001 μM. Additionally, the sensor had good stability and reproducibility, and it could be used for the detection of DA in real samples.
通过简单的水热法合成了银耳状 ZnInS（ZISt）和花状微球 ZnInS（ZISm）。研究发现，由于 ZISt 具有较大的表面积和较高的光催化活性，因此其在光电化学（PEC）传感方面优于 ZISm。制备了 ZISt 和石墨烯（GR）的复合材料，并将其用于多巴胺（DA）的 PEC 传感。在这里，DA 充当电子供体来清除空穴并抑制电荷复合。GR 增强了可见光吸收并加速了电子转移，放大了光电流信号。DA 与 ZISt 中 Zn(II)之间的强螯合配位相互作用保证了目标分析物的选择性吸附。因此，所得到的 ZISt/GR 光电极对 DA 表现出敏感和选择性的 PEC 响应。在优化条件下，线性响应范围为 0.01 至 20 μM，检测限低至 0.001 μM。此外，该传感器具有良好的稳定性和重现性，可用于实际样品中 DA 的检测。
