Topic > Synthesis of graphene nanosheets by electrochemical...

In the present work, an environmentally friendly, simple and economical two-step method is reported to develop graphene nanosheets (GNS) by electrochemical exfoliation of graphite and its subsequent reduction by microwaves . The morphology and microstructure of the prepared GNS are studied by atomic force microscopy (AFM), X-ray diffraction (XRD), ultraviolet (UV) spectroscopy, and Fourier transform infrared spectroscopy (FT-IR); experiments confirm the formation of high-quality graphene nanosheets (GNS). Our method is simple and versatile. This is a rapid process, as large production of graphene nanosheets could be done in a short time compared to the chemical reduction of graphene oxide. Secondly, it is convenient and environmentally friendly, does not consume expensive and dangerous chemicals in large quantities. KEYWORDS: Graphene. Graphite. Electrochemical exfoliation. Atomic force microscopy. Microwave reduction. Sonication. INTRODUCTION Graphene is a one-atom-thick two-dimensional building block of a carbon allotrope, which has emerged as a fascinating material of the 21st century, has received worldwide attention [1] due to its interesting properties such as having a Young's modulus high (~ 1.0 TPa),[2] exceptional mechanical resistance, large theoretical specific surface area (2630 m2g−1), high intrinsic mobility (200,000 cm2v−1s−1), [3,4] high thermal conductivity (~5000 Wm−1K−1) [5] and is an optically transparent material, absorbing only 2.3% of visible light and an optical transmittance of (~97.7%). [6]Several methods for preparing graphene are reported. These processes are micromechanical exfoliation of graphite [7], chemical vapor deposition (CVD) [8], solvothermal synthesis [9], epitaxial growth on an electrically insulating surface [8], and graphe reduction. .. half paper ......its applications in highly transparent and flexible conducting films,[29-32] Much effort should be made to reduce manufacturing costs, mainly those related to high-temperature process and substrates expensive. Chemical exfoliation methods based on the Hummer method, the thin production of graphene oxide (GO) from graphite, followed by chemical or thermal reduction, have attracted much attention because they are a low-cost, solution-process fabrication.[33- 45 ] However, the oxidation process damages the honeycomb lattices of graphene. Furthermore, the subsequent reduction of GO sheets requires high temperatures to recover the graphitic structure. [46-53]In this paper we demonstrate a new two-step approach to obtain high-quality graphene thin sheets by electrochemical exfoliation of graphite and then its subsequent reduction by microwave oven.