A Green Approach to the Synthesis of Graphene Nanosheets

Abstract

Graphene can be viewed as an individual atomic plane extracted from graphite, as unrolled single-walled carbon nanotube or as an extended flat fullerene molecule. In this paper, a facile approach to the synthesis of high quality graphene nanosheets in large scale through electrochemical reduction of exfoliated graphite oxide precursor at cathodic potentials (completely reduced potential: -1.5 V) is reported. This method is green and fast, and will not result in contamination of the reduced material. The electrochemically reduced graphene nanosheets have been carefully characterized by spectroscopic and electrochemical techniques in comparison to the chemically reduced graphene-based product. Particularly, FTIR spectra indicate that a variety of the oxygen-containing functional groups have been thoroughly removed from the graphite oxide plane via electrochemical reduction. The chemically converted materials are not expected to exhibit graphene's electronic properties because of residual defects. Indeed, the high quality graphene accelerates the electron transfer rate in dopamine electrochemistry (DeltaE(p) is as small as 44 mV which is much smaller than that on a glassy carbon electrode). This approach opens up the possibility for assembling graphene biocomposites for electrocatalysis and the construction of biosensors.

The Prospective Two-Dimensional Graphene Nanosheets: Preparation, Functionalization and Applications

“…TiO 2 nanoparticles play an important role in the reduction process. Guo et al [29] has reported that electrochemical reduction could work very well for the reduction of GO, which is a green approach to obtain CGR in aqueous dispersion. Recently, Li et al [30] reported a dry microwave synthesis method to obtain CGR, which can be considered to be the most efficient route to date in preparing CGR in the large scale.…”

Fusion of nacre, mussel, and lotus leaf: bio-inspired graphene composite paper with multifunctional integration

“…Furthermore, dopamine can absorb on the graphene surface due to its excellent affinity. 42 During the past few decades, graphene has been well-investigated and much work has been devoted to the synthesis, structures, properties, and possible applications of graphene. [43][44][45] Less work has been directed to the surface wetting behavior of graphene, although the wetting behavior of solid surfaces is a very important aspect of materials and can strongly affect their properties.…”

Fabrication and Characterization of Electrospun PHA/Graphene Silver Nano-Composite Scaffold for Antibacterial Application

“…The IR band appears at approximately 3414, 1725, 1626, 1245 and 1060 cm − 1 of rGO are assigned to -OH stretching vibrations, C=O stretching of Carboxylic groups, O H deformations of the C-OH groups, epoxy symmetrical ring deformation vibrations and C-O stretching vibrations, respectively [55]. The peaks at 1060 cm − 1 (C-O stretching vibrations), 1245 cm−1(C-OH stretching vibration) and 1725 cm − 1 (C=O stretching vibration) were become less intense; which suggests the reduction of graphene.…”