Synthesis of Graphene by laser method for using in electrochemical capacitors

Subject Areas :

shahab  khameneh asl ¹ (Assistant Prof. of materials eng. Department, university of Tabriz)
Majed  Namdar ² (Mechanical Eng. Faculty, University of Tabriz)

Received: 2017-04-17 Accepted : 2018-06-18 Published : 2018-05-22

Keywords: Synthesis, Graphene, Laser Scribed Graphene, Hummer&#039, s method, Supercapacitor,

Abstract :

In this research work, laser scribed technique has been regarded to synthesize graphene on the surface of a DVD and manufacture graphene super capacitors. For this purpose, first, by Hummers method, graphite was converted to graphene oxide (GO) in an acidic environment containing Sodium nitrate, Potassium permanganate and sulfuric acid. Centrifuges and ultrasonic devices were utilized for the homogenization of graphene oxide solution. GO homogeneous solution was applied on the surface of specific DVDs and the set was dried at room temperature. For GO reduction and transform it into graphene, a suitable laser, with programming of super capacitor particular pattern was used. By applying an energy with the amount of resonance frequency of graphene and oxygen bond, the laser broke the connection and the reduction action and reaching to graphene was done. In this study, the process of graphene synthesis and applying the super capacitor specific pattern were carried out in single step that is the biggest advantage of laser scribed graphene (LSG) method. In present study, TEM was utilized to examine the layered structure of GO, SEM was used for microstructural studies, two tests of cyclic voltammetry (CV) and galvanostatic charge/discharge (CC) were applied to study the performance and power of energy storage in super capacitors, the XPS was used to investigate elements present in the layer applied on DVD, and the Raman spectroscopy was applied to investigate the quality of prepared graphene through studying G and D peaks.

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