Konjugasi In Situ S-Doped Graphene Layer dengan Partikel Magnetit serta Karakterisasinya

Ningrum, Windy Lebya (2026) Konjugasi In Situ S-Doped Graphene Layer dengan Partikel Magnetit serta Karakterisasinya. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini bertujuan untuk mensintesis dan mengkarakterisasi material S-doped graphene layer-magnetite dengan variasi penambahan massa S-doped graphene layer sebanyak 50, 100, 150, dan 200 mg yang secara berturut-turut dinotasikan sebagai SGL(50)-Magnetit, SGL(100)-Magnetit, SGL(150)-Magnetit, dan SGL(200)-Magnetit. Material S-doped graphene layer disintesis dengan raw material grafit melalui metode interkalasi dan oksidasi grafit dalam asam sulfat diikuti dengan iradiasi microwave dan sonikasi. Selanjutnya, konjugasi S-doped graphene layer dengan magnetit dilakukan secara in situ melalui metode kopresipitasi. Material hasil sintesis dikarakterisasi dengan Fourier Transform Infrared (FTIR), X-Ray Diffraction (XRD), Spektroskopi Raman, X-Ray Photoelectron Spectroscopy (XPS), dan Particle Size Analyzer (PSA). Spektra FTIR menunjukkan pita serapan yang sesuai dengan S-doped graphene layer dan magnetit. Difraktogram XRD material sintesis menunjukkan puncak karakteristik 2θ = 26,2° yang berasal dari bidang (002) struktur grafitik serta puncak pada 30,2°; 35,5°; 44°; dan 57,2° yang sesuai dengan fase kristal magnetit. Rasio ID/IG Raman mengonfirmasi bahwa konjugasi dengan magnetit pada variasi SGL(100)-Magnetit dan SGL(150)-Magnetit menghasilkan tingkat cacat yang lebih rendah. Hasil XPS menunjukkan bahwa konjugasi dengan magnetit menyebabkan peningkatan intensitas puncak C‒O pada spektrum C 1s, kemunculan puncak Fe‒O pada spektrum O 1s, serta keberadaan komponen Fe2+ dan Fe3+ pada spektrum Fe 2p. Hasil PSA menunjukkan bahwa konjugasi dengan magnetit mampu menghasilkan ukuran partikel yang lebih seragam dibandingkan sampel S-doped graphene layer. Secara keseluruhan, SGL(150)-Magnetit menunjukkan karakteristik yang paling baik dengan rendahnya cacat struktur dan distribusi ukuran partikel yang cukup seragam, sehingga berpotensi digunakan sebagai filler membran DMFC untuk meningkatkan konduktivitas proton dan mengurangi permeabilitas metanol.
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This study aims to synthesize and characterize S-doped graphene layer-magnetite material with variations in the addition of S-doped graphene layer mass of 50, 100, 150, and 200 mg which are respectively denoted as SGL(50)-Magnetite, SGL(100)-Magnetite, SGL(150)-Magnetite, and SGL(200)-Magnetite. S-doped graphene layer material was synthesized with graphite raw material through intercalation and oxidation methods of graphite in sulfuric acid followed by microwave irradiation and sonication. Subsequently, the conjugation of S-doped graphene layer with magnetite was carried out in situ through coprecipitation method. The synthesized materials were characterized by Fourier Transform Infrared (FTIR), X-Ray Diffraction (XRD), X-Ray Photoelectron Spectroscopy (XPS), Particle Size Analyzer (PSA), and Raman spectroscopy. The FTIR spectra showed absorption bands corresponding to S-doped graphene layer and magnetite. The XRD diffractogram of the synthesized materials showed a characteristic peak at 2θ = 26.2°, corresponding the (002) plane of the graphitic structure and peaks at 30.2°; 35.5°; 44°; and 57.2° corresponding to the magnetite crystal phase. The ID/IG Raman ratio confirm that the incorporation of magnetite in SGL(100)-Magnetite and SGL(150)-Magnetite resulted in lower degree of structural defect. XPS results show that conjugation with magnetite causes an increase in the intensity of the C‒O peak in the C 1s spectrum, the appearance of the Fe‒O peak in the O 1s spectrum, and the presence of Fe2+ and Fe3+ components in the Fe 2p spectrum. PSA results show that conjugation with magnetite produced a more uniform particle size compared to the S-doped graphene layer sample. Overall, SGL(150)-Magnetite shows the best characteristics with low structural defects and relatively uniform particle size distribution, so it has the potential to be used as a DMFC membrane filler to increase proton conductivity and reduce methanol permeability.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Graphene, Magnetit, Sulfur, Filler, S-doped Graphene Layer-Magnetite, Graphene, Magnetite, Sulphur, Filler, S-doped Graphene Layer-Magnetite
Subjects:	Q Science Q Science > QD Chemistry Q Science > QD Chemistry > QD341.H9 Graphene
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Windy Lebya Ningrum
Date Deposited:	04 Aug 2026 06:34
Last Modified:	04 Aug 2026 06:34
URI:	http://repository.its.ac.id/id/eprint/143200

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