Garuda - Garba Rujukan Digital

Norman Syakir, Fitrilawati

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Author-ID : 5836530

Computer Science & IT Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology

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Characteristics of Graphene Like Material Synthesized from Coconut Shell Charcoal Powder using Solid State Method Baiq Lisna Najati; Norman Syakir, Fitrilawati
JIIF (Jurnal Ilmu dan Inovasi Fisika) Vol 7, No 1 (2023)
Publisher : Universitas Padjadjaran

We synthesized graphene like material from coconut shell charcoal powder (CSP) using solid-state method followed by exfoliation using H2SO4. In the synthesis, CSP was mixed with KOH in a ratio of 1:5 followed by heating at a temperature of 850ºC for 1 hour to obtain Coconut Shell Graphitization (CSG). The synthesized CSG was then exfoliated for 1 hour using ultrasonication in H2SO4 which was referred as Coconut Shell Graphitization_Exfoliated (CSG_E). The infrared spectra results of the two products showed the presence of C-C, C=C, C-O-C, C-O-OH groups which are characteristics of reduced graphene oxide (rGO). The Raman spectroscopy results show that the synthesized materials have D and G bands with ID/IG ratio of 0.98-0.96, that indicates the presence of impurities in the form of an oxide group on the graphene surface. Decomposition analysis using the help of the Lorentz Function show that the XRD pattern of the synthesized material have graphene structure at 2θ = 26.59º, and the rGO structure at 13.88º, and 19.09º with its 2nd order at 42.89º. The measurement results indicate that the synthesized materials are rGO. The data analysis shows that CSG consists of 83.09% rGO and 16.91% graphene, after exfoliation the rGO content of CSG_E rises to 87.27%

Characteristics of Graphene Like Material Synthesized from Commercial Activated Carbon of Coconut Shell Using a Modified Hummers Methods Dewi Asaningsih Affandi; Norman Syakir, Fitrilawati
JIIF (Jurnal Ilmu dan Inovasi Fisika) Vol 7, No 1 (2023)
Publisher : Universitas Padjadjaran

Commercial activated carbon of coconut shell (CS) was used as the raw material for synthesis of graphene like material using modified Hummers method. The structure of carbon CS is amorphous and contains natural minerals such silica, potassium, magnesium and calcium as impurities. Prior to use, we carried out a thermal pre-treatment process (heating) on CS in order to remove the impurities. Pieces of CS were grounded to the size of 200 mesh (CS1), then heated at a temperature of 850°C with heating rate 5°C/min for 2 hours in a furnace. The obtained material was referred as CS2. A precursor of CS1 or CS2 were mixed with sulfuric acid solution until homogen in a glass beaker that placed in an ice bath. Then, potassium permanganate powder was slowly added into the solution while stirring. After that, distilled water and H2O2 were added into the solution to stop the oxidation process. The produced precipitate was passed through purification, ultrasonication and drying processes. The obtained material synthesized from CS1 is referred as H-CS1 and the one synthesized from CS2 is referred as H-CS2. The characterization results using FTIR, Raman, XRD and Uv-Vis show the obtained materials have charachteristic as reduced graphene oxide (rGO) with ID/IG = 1.0056 in H-CS1 and ID/IG ratio = 0.9476 in H-CS2. This result indicates that thermal pre-treatment process has lower impurity and defect on H-CS2

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