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Hydrothermal preparation of reduced graphene oxide–silver nanocomposite using Plectranthus amboinicus leaf extract and its electrochemical performance

Yuhong Zheng, Aiwu Wang, Wen Cai, Zhong Wang, Feng Peng, Zhong Liu, Li Fu
Enzyme and Microbial Technology 2016 v.95 pp. 112-117
Fourier transform infrared spectroscopy, Plectranthus amboinicus, X-ray diffraction, X-ray photoelectron spectroscopy, electrochemistry, graphene, graphene oxide, hydrogen peroxide, ions, leaf extracts, nanocomposites, scanning electron microscopes, sensors (equipment), silver, transmission electron microscopes, ultraviolet-visible spectroscopy
Graphene based nanocomposites are receiving increasing attention in many fields such as material chemistry, environmental science and pharmaceutical science. In this study, a facial synthesis of a reduced graphene oxide-silver nanocomposite (RGO-Ag) was carried out from Plectranthus amboinicus leaf extract. The synthesized nanocomposite was characterized by using X-ray diffraction, scanning electron microscope, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscope and UV–vis spectroscopy for structural confirmation. The reduction of graphene oxide and silver ions was achieved simultaneously due to the reducibility of the Plectranthus amboinicus leaf extract. We further investigated the electrochemical properties of the biosynthesized RGO-Ag nanocomposite. A nonenzymatic H2O2 electrochemical sensor was shown to be successfully fabricated by using biosynthesized RGO-Ag nanocomposite. Moreover, the fabricated electrochemical sensor also showed good selectivity.