Darminto, Fahmi Astuti : Study on Phase, Molecular Bonding, and Bandgap of Reduced Graphene Oxide Prepared by Heating Coconut Shell

Prof. Dr. Drs. Darminto M.Sc
Fahmi Astuti S.Si, M.Si



Published in

2nd International Conference on Functional Material Science

External link



Seminar Internasional


molecular bonding energy band gap phase, carbon structure heating process reduced graphene oxide.


The purpose of this work is to identify the molecular bonding and phase of reduced graphene oxide prepared by heating of an old coconut shell. The characterization were performed by using FTIR, Uv-Vis and XRD spectroscopy. The heating temperature used in this work is 4000C and 6000C. Furthermore, the type of heating atmosphere used in this research are nitrogen, ambient air without and with rinsing step. The XRD analysis shows that the reduced graphene oxide phase is formed by turbostatic structure which is a pile of random arrangement of parallel layers that make up the graphite structure with cliftonite phase at temperature 4000C and 6000C. In the inert nitrogen gas treatment, there are two impurity phases such as potassium chlorate (KClO4) and sulfur (S11). The molecular bondings of C=C, C-C, C-O, C=O, C-H and O-H appeared on the FTIR spectra of the samples are indentified. Analysis by using linear regression and absorbance edge methods was conducted to result in the energy gap in the range from 0.14 to 0.67 eV, indicating that the material is a type of semiconductor material.