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All Journal Science and Technology Indonesia International Journal of Renewable Energy Development
Saputri, Dini Deviana
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

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Enhanced Performance of Epoxy Resin-Polyimide Hybrid Composites with Aminated Carbon Nanofibers Filler Saraswati, Teguh Endah; Saputri, Dini Deviana; Raharjo, Wijang Wisnu
Science and Technology Indonesia Vol. 10 No. 1 (2025): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.1.152-164

Abstract

Incorporating epoxy resin (ER) and polyimide (PI) with supporting filler will exhibit composites with exceptional mechanical, thermal, and electromagnetic shielding properties. This research investigates the preparation of aminated carbon nanofiber (CNF) as a filler in epoxy resin-polyimide hybrid composites. The preparation of the CNF filler was initially done by the purification process through dissolution in toluene and vacuum annealing at 800°C for 3 hours. The amine modification of CNF was done by reacting CNF with ethylenediamine, sodium nitrite, and sulfuric acid. The aminated CNF was then mixed with polyimide precursor (oxydianiline and pyromellitic dianhydride), becoming poly(amic acid)-filler. The last step was combining poly(amic acid)-filler with epoxy resin diglycidyl ether bisphenol A and polyaminoamide as hardener. The Scanning Electron Microscope (SEM) and Transmission Electron Microscopy (TEM) images of CNF showed the overlapped bundle fibers with the average fiber diameter around 100-120 nm. The successful amine modification was analyzed through Fourier-Transform Infrared (FTIR) analysis by the functional group emergence of C–N (∼1153 cm-1), N H (3737 cm-1), primary amine N–H (1534 cm-1), and better dispersion in water. The aminated filler shows a better distribution in the polymer matrices observed through macroscopic images and a higher hardness value. The FTIR of composites shows the increasing intensity in the N–H, C O amide, and C–H functional groups, indicating the highly covalent bonds between polymers and the aminated CNF filler. The TGA graph shows the recognizable termination of the polyimide and epoxy resin matrices as major components in the composite. The ER-PI composites with aminated CNF filler show improved mechanical properties in the hardness, tensile properties, and electromagnetic interference (EMI) shielding efficiency by around three-fold higher than composites with unmodified CNF filler.
N/S-doped carbon electrode derived from paper waste as a sustainable electric double-layer capacitor Rahmawati, Fitria; Aini, Nur; Ridwan, Qanita; Paramartha, I Gusti Ayu Filia; Putri, Denis Octareta Amelia; Saputri, Dini Deviana; Nugrahaningtyas, Khoirina Dwi; Heraldy, Eddy; Hidayat, Yuniawan; Nurcahyo, I. F.; Anggraningrum, Ivandini Tribidasari
International Journal of Renewable Energy Development Vol 14, No 3 (2025): May 2025
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.60846

Abstract

This research aims to produce N/S-doped Carbon Electrode derived from paper waste (NSCEp) for Electric Double-Layer Capacitor (EDLC). The paper waste holds potential as raw material for carbon production because of its high cellulose content, abundance of availability, and low price. To enhance the electrical performance of the carbon, an activation step was conducted, followed by double doping with nitrogen and sulfur using thiourea. The NSCEp result was analysed to examine its specific diffraction peaks, crystallinity, morphology, and elemental contents. The NSCEp powder was then mixed with dispersant to produce a homogeneous slurry for the electrode film. The EDLC was assembled in a sandwich-like structure, with sodium hydroxide (NaOH) solution impregnated in a separator between the carbon film electrodes. The EDLC assembly was conducted under an argon atmosphere in a CR2032 coin cell. The results found that the NSCEp provides a high electrical conductivity of 1.21 x 102 S/cm. The prepared EDLC achieved the specific capacitance value of 39.555 F/g as determined by cyclic voltammetry (CV) analysis. Furthermore, the EDLC demonstrates high initial charge-discharge capacities of 300.56 mAh/g and 248.88 mAh/g, respectively, at a current of 0.015 A/g. The capacity remains stable for up to 300 charge-discharge cycles.
Co-Authors Eddy Heraldy Fitria Rahmawati Ivandini Tribidasari Anggraningrum Khoirina Dwi Nugrahaningtyas Nur Aini Nurcahyo, I. F. Paramartha, I Gusti Ayu Filia Putri, Denis Octareta Amelia Ridwan, Qanita Teguh Endah Saraswati Wijang Wisnu Raharjo Yuniawan Hidayat