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NCPCM 2017 IOP Publishing IOP Conf. Series: Materials Science and Enginee1ri2n3g43536878(920‘1’8“)” 012063 doi:10.1088/1757-899X/338/1/012063 Preparation of few layer graphene sheets (FLGS) prepared by an electrochemical method I Alam, K Sa, S das, J Raiguru, BVRSSubramanyam, PC Mahakul and P Mahanandia* Department of Physics & Astronomy, National Institute of Technology Rourkela, Orissa- 769008, India *Email id-pmahanandia@gmail.com Abstract:Graphene with two dimensional structures is a very exceptional material, since it has advantage of being excellent conducting material. Few layer of graphene sheets (FLGS) have been successfully prepared by an electrochemical method directly from graphite using oxalic acid as electrolyte. The prepared few layer FLGS have been characterized by X-ray diffraction(XRD), UV-Vis spectroscopy, field emission scanning electron microscope(FESEM), transmission electron microscope(TEM). The characterization reveals that the prepared FLGS is very good in quality. The measured current (I) vs voltage (v) shows that FLGS are highly conducting in nature. The hydrophobicity/Hydrophilicity of the prepared FLGS have been investigated for various applications. Introduction: Since the discovery of one-atom-thick single layer of SP2 bonded carbon atomsgraphenesheet in 2004 [1], closely packed honeycomb crystal lattice has paying attention from fundamental research and its application [2].The unique various properties such as electrical, physical, optical etc. has great application in Field-effect transistor [3,4], ultrasensitive sensors [5], electrochemical devices [6], transparent electrodes [7], different nanocomposite [8], batteries [9], supercapacitors [10] and hydrogen storage [10]. Main research focus is for the preparation of graphene in large scale with low cost due to the exotic physical properties and the predicted applications in science and technology. The methods toprepare a graphene sheets are mechanical exfoliation [1], Epitaxial growth [11], and chemical vapour deposition [12].However, the above methods are not effectively influenced of the mass production due to their low yield and high cost. There must be required another technique to produce the mass production of graphene with low cost, scalability, reproducibility, process ability and quality for the commercial application of the industrial purposes.Reduced graphene oxide(RGO) is the same like as graphene which is obtained from graphene oxide (GO) using another type of reducing agents [13,14].There are to be found heavily oxygenated by way of hydroxyl and epoxide functional groups on the surface and at the edges [15] of the obtained graphene sheet in which the electrical property is degraded.There are another method to prepare graphene straightforwardly from graphite exclusive of functional groups. This method is a one-step amalgamation of ionic-liquid-functionalized graphene sheet, also called electrochemical method [16]. In this method awful impurities for example nitrogen and water arises on the surface of graphene sheet. Highly eminence graphene was prepared by Su et al. by electrochemical exfoliation with strong sulfuric acid like as the electrolyte [17] which can smash up the honeycomb lattice throughout preparation.For the high quality few layer of graphene sheet, an electrochemical method from graphite via oxalic acid as electrolyte has been reported to avoid impurities and functional groups [18]. We have investigated the hydrophobic and hydrophilic nature of the graphene prepared by electrochemical method as reported earlier. The graphene sheets obtained in these methods do not contain any functional groups of carbon with maintaining the hexagonal structure with better electrical property. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd 1PDF Image | graphene sheets (FLGS) prepared by an electrochemical method
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