Transformation of Graphite into Graphene Oxide and Graphene Using Modified Hummers Method with Structure and Optical Properties Characterization

• Main Author: Satya Adelizar, Arie
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/32196
• Institution: Institut Teknologi Bandung

Nowadays, the demand of touchscreen devices is rapidly increasing. A transparent conductive layer is one of the main requirement for such devices. There are many types of materials that can be used for transparent conductive layer, such as Indium Tin Oxide (ITO), Fluorine-doped Tin Oxide (FTO) and Aluminum-doped Zinc Oxide (AZO). Graphene is an allotrope of carbon which forms a very thin sheet with good mechanical and electrical properties. It is potentially applied as a conductor material because of its nature as a good electron carrier and very thin dimensions. Therefore, graphene has advantages to be used as a transparent conductive layer. Graphite as a starting material for graphene has Raman shift in the G peak at 1582 cm-1 and G'(or 2D peak) at 2700 cm -1 with intensity G peak higher than the intensity of the G'. In contrast to that, graphene has a higher G' intensity peak than G. In this study, graphite was combusted at 1000oC with varying combustion-time, starting from 1 to 20 minute. The purpose of this combustion process is to reduce the concentration of amorphous carbon which was indicated by the decrease of fluorescence signal. Graphene was then synthesized from graphite through the modified-Hummers method based on chemical oxidative cleavage. Graphite was oxidized into graphene oxide using ammonium persulfate, which was then reduced further to produce graphene. Characterization used in this study are Raman spectroscopy, UV-VIS diffuse reflectance, and Scanning Electron Microscope (SEM).