Document Type : Original Article
Authors
New materials Lab., University of Tabriz, Tabriz, Iran, P.O.Box: 5166614766
Abstract
Graphene is a flat layer of carbon atom, and is a layer of graphite with a thickness of a few tenths of a nanometer that, due to its porous structure and high ionic transfer rate, has been considered in electronic applications, such as cloud storage capacitors with high energy. In this research work, laser-scribed technique has been regarded to synthesize graphene on the surface of a DVD with simples laser equipment and manufacture graphene and graphene composite supercapacitors for the first time without masking. For this purpose, first, by Hummer's 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 its transformation into graphene, a suitable laser, with programming of supercapacitor particular pattern was used. By applying energy with the amount of resonance frequency of graphene and oxygen bond, the laser broke the connection and the reduction in action and reaching to graphene was done. Thus, the optimal wavelength of laser was determined to reduce the GO. In this study, the process of graphene synthesis and applying the supercapacitor 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 mono layered structure of GO, SEM was used for microstructural studies of prepared arrays, two tests of cyclic voltammetry (CV) and galvanostatic charge/discharge (CC) were applied to study the performance and power of energy storage in supercapacitors (10 F/g) that six order higher than normal G supercapacitors with repeatability 95% in 10000 cycles, 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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