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Rahmat Hidayat
Department of Physics, Universitas Negeri Padang, Padang 25131, Indonesia
Control & Systems Engineering Electrical & Electronics Engineering Materials Science & Nanotechnology Physics

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Journal : Journal of Experimental and Applied Physics

 1 
Analysis of the Electrical Properties of Graphene Oxide from Bamboo Betung Synthesized by the Modified Hummers Method Reka Anisha Reza Putry; Ramli Ramli; Ratnawulan Ratnawulan; Rahmat Hidayat
Journal of Experimental and Applied Physics Vol 1 No 1 (2023): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i1.2

Abstract

The purpose of this study is to know the capacitance and conductivity  of graphene oxide made from betung bamboo. Betung bamboo was synthesized using modified hummers method. The carbonization procedure, which will be the control variable in this study, will be carried out in the first stage at four different temperatures for an hour: 300°C, 350°C, 400°C, and 450°C. The results are identified by the initials GO300, GO350, GO400, and GO450. The samples were then characterized using the XRD (X-Ray Diffraction), SEM (Scanning Electron Microscope), FTIR (Fourier Transform Infrared), and LCR Meter instruments. At a temperature of 400 °C, the LCR Meter measured the greatest conductivity and conductance values, with values of 5.43x10-6 S/cm for conductivity and 5.66x10-7 F/m2 for area capacitance. And according to the average conductivity and conductance values, this graphene oxide is situated in the region of semiconductor materials conductivity values.
Effect of Variations in Banana Frond Fiber Composition with Polyurethane Matrix on Composite Panels Acoustic Properties and Porosity Vini Oktavia; Yenni Darvina; Ramli Ramli; Rahmat Hidayat
Journal of Experimental and Applied Physics Vol 1 No 1 (2023): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i1.3

Abstract

Noise can damage one's health, affect one's comfort, cause stress, and make activities not run smoothly. Making acoustic materials is one of the efforts made to overcome noise pollution. The material used in this study comes from banana fiber with a polyurethane matrix. This research material is easily and widely available. The advantage of this study is to determine the effect of variations in the composition of banana stem fiber with a polyurethane matrix on the values of the sound reflection coefficient, sound absorption coefficient, sound transmission loss, and porosity. The method used is a hand lay-up with a single microphone tube impedance characterization tool and an analytical balance. In this study, variations in the composition of the composite panels with fiber and matrix variations were carried out, namely 60%:40%, 70%:30%, and 80%:20%. Based on the findings of this study, the higher the sound absorption coefficient, sound transmission loss, and porosity, the lower the sound reflection coefficient. If the frequency used is higher, the values of the sound absorption coefficient and transmission loss increase, while the reflection coefficient decreases for the entire frequency range. If the porosity is higher, the acoustic properties will be better, which is indicated by an increase in the value of the sound absorption coefficient and the value of the sound transmission loss. High porosity will comply with the ISO 11654:1997 standard.
Co-Authors Ramli Ramli Ratnawulan . Reka Anisha Reza Putry Vini Oktavia Yenni Darvina