Abstract
ABSTRACT In this work, platinum nanoparticles (PtNPs) decorated on poly diallyldimethylammonium chloride (PDDA) functionalised molybdenum disulphide-reduced graphene oxide (MoS2-rGO) was successfully synthesised via hydrothermal process. The morphology and structures of the obtained PtNPs-MoS2-rGO nanocomposite were characterised by UV-vis spectroscopy, transmission electron microscopy and x-ray photoelectron spectroscopy. The nanocomposite combines the large surface area and good electrical properties of MoS2-rGO with the excellent catalytic activity of PtNPs and shows great electrochemical signal enhancement towards binaphthol oxidation. Based on this, an electrochemical sensing interface was constructed for binaphthol determination. Under the optimal conditions, the peak currents display linear response with the concentration of binaphthol over the range from 0.4 to 10 μM and 10 μM to 40 μM. The limit of detection was calculated to be 0.07 μM (S/N = 3). The sensor also has the advantages of simple preparation, good stability and reproducibility. These characteristics make the sensor is promising for the detection of binaphthol and its derivatives in pesticide and pharmaceutical application industries.
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