AbstractThe authors have prepared SnSe nanosheets by a solvothermal method and used them to modify a gold electrode to obtain a photoelectrochemical (PEC) sensor for dopamine (DA) which yields a signal upon irradiation with visible light. On addition of DA, the photocurrent is significantly higher than in the absence of DA, and it increases with increasing DA concentration. A PEC sensor was developed based on this finding which responds linearly to DA in the 0.01 μM to 10 μM concentration range and with a 3 nM detection limit. The application of this PEC sensor in actual samples was also tested. The mechanism of PEC analysis of DA is provided. The electrons of SnSe NSs were excited under irradiation with visible light and transformed from valance band to conduction band. DA as electron donor provided the electrons to SnSe NSs. An enhanced photocurrent was obtained. Graphical abstractSchematic of a photoelectrochemical platform for sensing dopamine by using a gold electrode modified with SnSe nanosheets. It has a detection limit of 3 nM.

中文翻译：

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基于用 SnSe 纳米片修饰的金电极的光电化学多巴胺传感器

摘要 作者通过溶剂热法制备了 SnSe 纳米片，并用它们修饰金电极以获得多巴胺 (DA) 的光电化学 (PEC) 传感器，该传感器在可见光照射下产生信号。添加 DA 后，光电流明显高于不存在 DA 时的光电流，并且随着 DA 浓度的增加而增加。基于这一发现开发了 PEC 传感器，该传感器对 0.01 μM 至 10 μM 浓度范围内的 DA 呈线性响应，检测限为 3 nM。还测试了该 PEC 传感器在实际样品中的应用。提供了 DA 的 PEC 分析机制。SnSe NSs 的电子在可见光照射下被激发并从价带转变为导带。DA 作为电子供体向 SnSe NSs 提供电子。获得了增强的光电流。图解摘要：使用 SnSe 纳米片修饰的金电极感测多巴胺的光电化学平台示意图。它的检测限为 3 nM。