▎ 摘　　要

This work reports a one-step simple synthesis method for functionalized reduced graphene oxide (RGO) nanosheets by a Platanus orientalis leaf extract polyphenol-mediated deoxygenation of graphene oxide (GO). Microscopic and spectroscopic characterization revealed the successful deoxygenation of GO and subsequent stabilization by oxidized polyphenols of plant extract. X-ray photoelectron spectroscopy, Raman spectroscopy, and X-ray diffraction analyses were used to examine the reduction of GO. Fourier transform infrared spectroscopy results revealed capping of RGO with oxidized polyphenols of Platanus orientalis extract, which prevented aggregation of graphene sheets. Transmission electron microscopy and atomic force microscopy images revealed the formation of thin, transparent, sheet-like graphene. The in vitro cytotoxicity of synthesized RGO exhibited a dose-dependent toxicity against cardiac cell lines of Catla catla. Further, this work opens up a green synthesis route for the development of new graphene-based technologies. (C) 2016 Published by Elsevier B.V.