Solvothermal Synthesis of Sb ₂ S ₃ -Graphene Oxide Nanocomposite for Electrochemical Detection of Dopamine

Abstract

Antimony sulfide graphene oxide (Sb 2 S 3 -GO) was synthesized using a solvothermal method for electrochemical detection of dopamine (DA). Thiourea acted as a sulfur source, while polyvinyl pyrrolidone (PVP) acted as a surfactant to fabricate nanoproduct in the presence of GO. X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectra, Energy-dispersive X-ray spectrum (EDS), Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) were employed to characterize Sb 2 S 3 -GO nanocomposite, and the results exhibited a large number of spherical Sb 2 S 3 particles were attached to the surface of GO. Electrochemical techniques were used to study the performance of sensor, and the results showed the sensor has excellent electrochemical characteristics to detect DA with linear ranges of 1.55 μ M–15.55 μ M, 15.55 μ M–0.35 mM, excellent sensitivity of 307.7 μ A mM −1 cm −2 and 205.4 μ A mM −1 cm −2 , and a low detection limit of 0.8 μ M (at an S/N radio of 3). Therefore, Sb 2 S 3 -GO can be used potential sensing material to detect dopamine.