Serotonin (5-HT) is a crucial neurotransmitter in the body, with its levels being particularly significant for life safety. Here, we designed the AgBiS/CuMoS S-scheme heterojunction by uniformly immobilizing lamellar CuMoS on the surface of three-dimensional (3D) flower-like AgBiS using a simple physical mixing technique. In this case, AgBiS and CuMoS are bonded together by electrostatic attraction to form an active surface with a large specific surface area. Subsequently, the detector 5-HT bound to AgBiS/CuMoS/GCE undergoes hole oxidation and the photocurrent signal increases significantly. Meanwhile, the reaction mechanism of AgBiS/CuMoS composite material was investigated through density functional theory calculations. The AgBiS/CuMoS/GCE sensor demonstrates a low detection limit of 0.046 nM and a wide linear range (0.0001-8 μM). Furthermore, by comparing UV-Vis spectrophotometry and fluorescence spectroscopy for the detection of 5-HT in human serum, it was proved that the sensor has an impressive recovery rate.
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