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All Journal Pillar of Physics: Jurnal Berkala Ilmiah Fisika
Ramli, -
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Earth & Planetary Sciences Materials Science & Nanotechnology Physics

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Effect of Addition of Seaweed (Sargassum Sp) Charcoal with Pure Graphite on The Optical Properties of Graphene Oxide Synthesized by the Modified Hummer’S Method kurniawati, Rega; Ramli, -; Gusnedi, -; Hidayat, Rahmat
PILLAR OF PHYSICS Vol 17, No 1 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14238171074

Abstract

Synthesis of graphene oxide from a mixture of pure Graphite and seaweed charcoal using a modified Hummers method was carried out with five variations of the composition, namely 100% graphite, 70% graphite– 30% seaweed, 60% graphite – 40% seaweed, 50% - 50%, 100% seaweed. From this experiment, it will be seen how adding seaweed with Graphite affects the optical properties of the resulting graphene oxide. Characterization was carried out using FTIR, XRD, and SEM, and for optical properties, a UV-Vis Spectrophotometer was used. The FTIR test results showed the presence of carbon (C), hydrogen (H), and oxygen (O) functional groups. The XRD test results showed the crystal size of graphene oxide, and the SEM test showed graphene oxide's morphology in the form of thin sheets and chunks. The FTIR, XRD, and SEM tests showed that adding seaweed with Graphite had no effect. The results of the UV-Vis Spectrophotometer test showed that the highest absorbance value was at a variation of 50% - 50%, namely 49.547 at a wavelength of 245 nm, while for the lowest energy gap value, namely the variation of 100% seaweed 2.2875 eV and the highest 100% graphite 4, 2393 eV, the energy gap shows that there is an influence, the more seaweed composition used, the lower the energy gap
Effect of Addition of Seaweed (Sargassum sp) Charcoal with Pure Graphite on the Electrical Properties of Graphene Oxide Synthesized by the Modified Hummer’s Method Ra'uf, Andhyka; Ramli, -; Gusnedi, -; Hidayat, Rahmat
PILLAR OF PHYSICS Vol 17, No 1 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13916171074

Abstract

Graphite is the primary raw material used to create graphene oxide. However, other biomass sources can also be used to create or combine the carbon source. Seaweed (Sargassum sp.), which has a decent carbon content, was used in this study as the biomass used as a carbon source for mixing. The objective of this research is to ensure how adding seaweed charcoal will affect the electrical characteristics of graphene oxide. The modified Hummer process was used to create the materials. There are four different compositions available: pure graphite (100%), 70:30 (graphite and seaweed), 60:40 (graphite and seaweed), and 50:50 (graphite and seaweed). The product of graphene oxide variations made from other compositions will be compared to those of 100% graphite composition. The result demonstrated that the addition of seaweed charcoal to the graphene oxide synthesis was successful. It can be seen from some of the characteristics of graphene oxide at an angle of 2Ɵ by XRD testing. In the FTIR test, it was discovered that the graphene oxide sample contained C-O, C=O, C=C, and O-H functional groups, and in the SEM test, peeling was discovered on the sample surface as a result of the oxidation process. The addition of seaweed charcoal with pure graphite synthesized by the modified Hummers method affects the electrical properties of the resulting graphene oxide. The material's conductivity value and the area capacitance value of the graphene oxide material both drop in the LCR Meter characterization instrument.
Synthesis of Graphene Oxide from Sugarcane Bagasse by Using Modified Hummers Method as a Microwave Absorber Rahma, Mila Devita; Ramli, -; Gusnedi, -; Yohandri, -
PILLAR OF PHYSICS Vol 17, No 2 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14821171074

Abstract

Bagasse, a residue from sugarcane processing, is chosen as the raw material due to its potential as an environmentally friendly, inexpensive, and easily obtainable carbon source. The modified Hummers method is a modification of the original Hummers method, incorporating thermal treatment in the initial synthesis stage to enhance the efficiency and quality of synthesis. The thermal treatment aims to improve the efficiency and quality of the synthesized graphene oxide. The modification is carried out in the synthesis process to obtain a high-quality product with better efficiency. Furthermore, this modification can also reduce synthesis time and minimize the risk of damage to the raw material. After the synthesis process is completed, the produced graphene oxide is characterized using various analytical techniques, including Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The synthesized graphene oxide is then tested for its ability to absorb microwaves at X-band frequencies (8-12 GHz). The characterization results indicate that the synthesized graphene oxide possesses a homogeneous structure with thin graphene layers and a clean surface. Moreover, the graphene oxide also exhibits excellent microwave absorption properties at an X-band frequency of 10.16 GHz, with a reflection loss value of -23.94 dB, absorption coefficient of 93.65%, and absorption bandwidth of 1.13 GHz. The test results demonstrate that the graphene oxide derived from bagasse exhibits significant absorption capabilities towards microwaves at specific frequencies. This indicates the potential application of graphene oxide as an effective microwave absorber material.
Analysis of XRD Characterization of Fe3O4/Polypyrrole Nanocomposite Prepared by Sol-Gel Method Febriani, Annisa; Ramli, -; Gusnedi, -; Darvina, Yenni
PILLAR OF PHYSICS Vol 17, No 2 (2024)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13525171074

Abstract

Nanocomposites can be thought of as solid structures with nanometer-scale dimensions that repeat at the distances between different structural constituents. In this study, Fe3O4 was used as a filler and Polypyrrole polymer as the matrix material. This research was conducted by varying the Fe3O4: Polypyrrole composition of 5 variations including 30%, 40%, 50%, 60%, and 70% w/w. This research was conducted to analyze the results of the XRD characterization of Fe3O4/Polypyrrole nanocomposite using the sol-gel method. The tool used in this research is X-Ray Diffraction (XRD) obtained the phase structure, crystal size, and microstrain. Based on the results of the study, the greater the polypyrrole composition, the greater the crystal size and microstrain. Details of the results are described in this paper.
Co-Authors Annisa Febriani, Annisa Gusnedi, - kurniawati, Rega Ra'uf, Andhyka Rahma, Mila Devita Rahmat Hidayat Yenni Darvina Yohandri