Samnur, N. Azizah, N. Fahira, Zurnansyah, Dirfan Zabrian, V. Zharvan, E.H. Sujiono
RGO and P-RGO samples based on coconut shell waste have been synthesized by exfoliation method. These samples were characterized using XRD, FTIR, and UV-Visible spectroscopy to obtain their crystal structure, functional group and optical properties. XRD results of the RGO and P-RGO samples show two peaks that are similar to those of RGO and P-RGO synthesized from pure (commercial) graphite. FTIR characterization of the RGO sample shows the hydroxyl (-OH), aromatic (-C=C), epoxy (C-O) and alkoxy (C-O) functional groups at 3449.39, 1627.63, 1216.58 and 1045.88 cm -1, respectively. Meanwhile, the P-RGO sample shows the hydroxyl (-OH), aromatic (C = C) and epoxy (CO) functional groups formed at 3450.51, 1628.02 and 1229.14 cm - 1, respectively. In addition, UV-Visible results for RGO and P-RGO show sufficient optical performance. The band gap energy values of the samples obtained using the Tauc plot method are 3.50 eV and 4.41 eV, indicating the semiconductor properties. © 2021 Sumy State University. All Rights Reserved.
Department of Mechanical Engineering, Universitas Negeri Makassar, Makassar, 90224, Indonesia; Laboratory of Materials Physics, Department of Physics, Universitas Negeri Makassar, Makassar, 90224, Indonesia
