Pengaruh Suhu Dan Waktu Proses Hidrotermal Pada Struktur Dan Sifat Optik 2H-MoS2

Saldi, Wardah Maulida (2026) Pengaruh Suhu Dan Waktu Proses Hidrotermal Pada Struktur Dan Sifat Optik 2H-MoS2. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini mengkaji pengaruh variasi suhu (200, 210, dan 220 °C) serta waktu sintesis hidrotermal (24, 36, dan 48 jam) terhadap pembentukan fase, struktur kristal, sifat optik, morfologi, dan komposisi unsur MoS₂. Karakterisasi dilakukan menggunakan XRD, Raman, UV–Vis, dan SEM–EDX. Hasil menunjukkan seluruh sampel berhasil membentuk fase 2H-MoS2. Berdasarkan analisis XRD, sampel M210B menunjukkan jarak antarbidang (d002) yang paling mendekati nilai standar 2H-MoS₂, disertai ukuran kristalit dan jumlah lapisan sekitar 2–5 lapisan yang mengindikasikan struktur few-layer dengan kristalinitas yang baik. Spektrum Raman mengonfirmasi terbentuknya MoS₂ berlapis sedikit melalui mode E¹₂g dan A₁g dengan selisih bilangan gelombang sebesar 22,66–24,28 cm⁻¹. Hasil UV–Vis menunjukkan nilai celah pita energi sebesar 0,63–1,09 eV, dengan nilai tertinggi sebesar 1,09 eV diperoleh pada sampel M210B. Citra SEM memperlihatkan bahwa M210B memiliki morfologi lembaran yang paling homogen dengan tingkat aglomerasi yang lebih rendah dibandingkan sampel lainnya, sedangkan analisis EDX menunjukkan rasio atom Mo:S sebesar 1:1,26–1:1,55 yang mengindikasikan adanya defisiensi sulfur, dengan komposisi M210B paling mendekati rasio stoikiometri ideal 1:2 yaitu 1:1,55. Secara keseluruhan, sintesis hidrotermal pada suhu 210 °C selama 36 jam menghasilkan sampel M210B dengan kombinasi struktur kristal, sifat optik, morfologi, dan komposisi unsur yang paling baik dibandingkan variasi kondisi sintesis lainnya.
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This study investigates the effects of hydrothermal synthesis temperature (200, 210, and 220 °C) and reaction time (24, 36, and 48 h) on the phase formation, crystal structure, optical properties, morphology, and elemental composition of MoS₂. The synthesized samples were characterized using XRD, Raman spectroscopy, UV–Vis spectroscopy, and SEM–EDX. The results demonstrate that all samples were successfully synthesized in the 2H-MoS₂ phase. XRD analysis revealed that sample M210B exhibited an interlayer spacing (d₀₀₂) closest to the standard value for 2H-MoS₂, along with a crystallite size corresponding to approximately 2–5 stacked layers, indicating a well-crystallized few-layer structure. Raman spectroscopy further confirmed the formation of few-layer MoS₂ through the characteristic E1₂g and A1g vibrational modes, with a frequency separation ranging from 22.66 to 24.28 cm⁻¹. UV–Vis spectroscopy showed that the optical band gap varied from 0.63 to 1.09 eV, with the highest value (1.09 eV) observed for sample M210B. SEM analysis revealed that M210B possessed the most uniform sheet-like morphology with a lower degree of agglomeration than the other samples. EDX analysis indicated Mo:S atomic ratios ranging from 1:1.26 to 1:1.55, suggesting sulfur deficiency in all samples. However, M210B exhibited the composition closest to the ideal stoichiometric ratio of 1:2, with an Mo:S ratio of 1:1.55. Overall, hydrothermal synthesis at 210 °C for 36 h produced sample M210B, which exhibited the most favorable combination of crystal structure, optical properties, morphology, and elemental composition among all synthesis conditions investigated.

Item Type:	Thesis (Masters)
Subjects:	Q Science > QC Physics Q Science > QC Physics > QC100 Crystals. Q Science > QC Physics > QC451 Spectroscopy Q Science > QC Physics > QC 611.97.T46 Temperature effects. Including transition temperature
Divisions:	Faculty of Mathematics and Science > Physics > 45101-(S2) Master Thesis
Depositing User:	Wardah Maulida Saldi
Date Deposited:	04 Aug 2026 04:18
Last Modified:	04 Aug 2026 04:18
URI:	http://repository.its.ac.id/id/eprint/141689

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