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All Journal JFA (Jurnal Fisika dan Aplikasinya)
Darminto Darminto
ITS
Physics

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Study of the formation of amorphous carbon and rGO-like phases from palmyra sugar by variation of calcination temperature Fahmi Astuti; Novita Sari; Vera Laviara Maghfirohtuzzoimah; Retno Asih; Malik Anjelh Baqiya; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 16, No 2 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i2.6706

Abstract

We have processed biomass from palmyra sugar to produce allotrope carbon by heating process with the variation of calcination temperature. The formation of amorphous carbon (a-C) was confirmed from the XRD result heated at 400°C with the observation of the peak at the position of ~24o. By increasing the temperature at 700°C, the presence of two peaks at 24o and 43o were observed, indicating the formation of rGO-like phase. The functional groups detected by FTIR spectra consist of C=C, C-O, C=O, C-H and O-H. The result of conductivity measurement exhibits that the material can be classified as semiconducting materials.
Structure Identification of Nanopowder TiO2 Synthesized by Coprecipitation Method Vicran Zharvan; Gatut Yudoyono; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 19, No 1 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i1.15475

Abstract

Titanium dioxide, or TiO2 is a semiconductor material with many advanced applications, such as photocatalysts. Generally, TiO2 has three primary forms of crystal structure: anatase, brookite, and rutile. Among these types of crystal structures, anatase has good properties in photocatalysts application due to its band gap value (3.20eV) and stability. Further, there are many methods to synthesize TiO2, such as sol-gel, hydrothermal method, etc. Still, the copreciptation method has a suitable method because it is easy to produce, high pure product and low cost. However, many parameters control the quality of TiO2 itself: pH, temperature, time and mechanical process. Especially for the mechanical process, no results were reported about structure identification of TiO2 at mixing time below 25 hours. In this research, titanium dioxide (TiO2) powder has been investigated using coprecipitation method and TiCl3 as a raw material. The TiO2 was synthesized by mixing the time duration at 5, 10 and 25 hours in this method. Analysis using x-ray diffraction shows that all the samples have an anatase phase. Further, Rietveld refinement analysis shows that mixing duration time does not significantly affect the lattice parameters.
Co-Authors Astuti, Fahmi Gatut Yudoyono Malik Anjelh Baqiya Novita Sari Retno Asih Vera Laviara Maghfirohtuzzoimah Vicran Zharvan