Abstract
The 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.
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