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Ramli
Department of Physics, Universitas Negeri Padang
Control & Systems Engineering Electrical & Electronics Engineering Materials Science & Nanotechnology Physics

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Effect of Addition of Seaweed (Sargassum sp.) Charcoal with Pure Graphite on the Microstructure of Graphene Oxide Synthesized by the Modified Hummer’s Method Gebby Wevi Angraini; Ramli
Journal of Experimental and Applied Physics Vol 1 No 2 (2023): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i2.18

Abstract

Graphite acts as a source of carbon which is used in the synthesis of graphene oxide. Graphite has a fairly high price, so there are limitations to the use of graphite on a large scale. Brown sea grass (Sargassum sp.) contains carbon and is not yet well exploited in Indonesia, so experiments can be done by mixing graphite and Sargassum sp. to minimize excessive use of graphite. The purpose of this study is to determine the addition of Sargassum sp. charcoal could affect the microstructure of graphene oxide synthesized using the modified Hummer method. Where a comparison of 5 variations of the composition of pure graphite and Sargassum sp. charcoal was carried out, namely (100:0; 70:30; 60:40; 50:50, and 0:100) %. The resulting graphene oxide was characterized by X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR), and Scanning Electron Microscope (SEM). It can be concluded that the addition of Sargassum sp. charcoal to pure graphite influences the microstructure of the graphene oxide. In the XRD test, an average crystal size of 24-33 nm with a cubic crystal structure was obtained; in the FTIR test, there was a bond between carbon (C), hydrogen (H), and oxygen (O); and in the SEM test, the average particle size was 1647–1887 nm. If 30% Sargassum sp. charcoal is added to 70% pure graphite, the larger the particle size. This causes the surface pores to become larger so that their properties as supercapacitors are better produced and have structures that tend to be like pieces.
Analysis of Optical Properties of Graphene Oxide from Bamboo Petung (Dendrocalamus Asper) Synthesized by Modified Hummer Method Indah Safira; Ramli; Yenni Darvina; Fadhila Ulfa Jhora
Journal of Experimental and Applied Physics Vol 1 No 2 (2023): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i2.20

Abstract

Carbon, hydrogen and oxygen are abundant in the structure of graphene oxide (GO), often known as graphene. In this study, petung bamboo was used in the manufacture of graphene oxide. The aim of this research is to find out how the sintering temperature influences the ability of graphene oxide to absorb waves. The modified hummer method is used to oxidize graphite and produce Graphene Oxide. This research was divided into several parts, namely burning carbonized petung bamboo, production of graphene oxide, and sonication and neutralization of graphene oxide using sintering temperatures of 300°C, 350°C, 400°C and 450°C. The synthesis results were characterized using a UV-Vis spectrometer to obtain an absorption spectrum resulting in a band gap of 2.68 eV-4.38 eV in Petung bamboo at a sintering temperature of 300oC - 400oC, the bandgap increasing as the sintering temperature increased. At a sintering temperature of 400oC - 450oC the band gap value decreases which is influenced by the results of cell changes from refinement which can change the band structure thereby affecting the size of the band gap. The absorption value obtained in the optical properties decreases because the high sintering temperature causes the reaction rate to become faster so that the absorption value becomes lower.
Co-Authors Fadhila Ulfa Jhora Gebby Wevi Angraini Indah Safira Yenni Darvina