Shofiqoh, Ananda Nur (2026) Sintesis dan Karakterisasi Nanopartikel Besi Oksida melalui Metode Elektrolisis: Pengaruh Variasi Tegangan terhadap Pembentukan Fase dan Transformasi Termal. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Nanopartikel besi oksida merupakan salah satu nanomaterial yang banyak dikembangkan karena memiliki berbagai fase kristal dengan karakteristik struktur, sifat magnetik, dan karakteristik termal yang berbeda sehingga berpotensi diaplikasikan pada berbagai bidang, seperti lingkungan, energi, kesehatan, katalisis, dan sensor. Penelitian ini bertujuan untuk mengetahui pengaruh variasi tegangan terhadap pembentukan fase dan transformasi termal nanopartikel besi oksida yang disintesis menggunakan metode elektrolisis. Sintesis dilakukan menggunakan elektroda besi dan larutan elektrolit Na₂SO₄ 0,01 M pada variasi tegangan 1, 2, 3, 4, dan 5 V selama 2 jam. Karakterisasi dilakukan menggunakan X-ray Diffraction (XRD) untuk mengidentifikasi fase kristal dan ukuran kristalit, Simultaneous Thermal Analysis (STA) untuk mengevaluasi karakteristik termal, serta Scanning Electron Microscopy–Energy Dispersive X-ray Spectroscopy (SEM–EDX) untuk menganalisis morfologi dan komposisi unsur. Hasil penelitian menunjukkan bahwa peningkatan tegangan sintesis memengaruhi pembentukan fase serta karakteristik nanopartikel besi oksida, yang ditunjukkan oleh meningkatnya jumlah endapan, respons magnetik, ukuran kristalit, perubahan morfologi, komposisi unsur, dan karakteristik termal material. Karakterisasi XRD menunjukkan bahwa sampel hasil sintesis pada tegangan 1 V dan 2 V didominasi oleh fase lepidokrosit (γ-FeOOH), sedangkan pada tegangan 5 V didominasi oleh fase magnetit (Fe₃O₄) dengan ukuran kristalit berturut-turut sebesar 5,75 nm, 16,28 nm, dan 31,54 nm. Karakterisasi SEM–EDX menunjukkan bahwa sampel γ-FeOOH memiliki morfologi berupa agregat berlapis (flake-like), sedangkan sampel Fe₃O₄ memiliki morfologi granular yang lebih kompak, serta mengonfirmasi bahwa material tersusun atas unsur Fe dan O yang terdistribusi secara homogen. Analisis STA menunjukkan bahwa sampel 2 V mengalami kehilangan massa kumulatif sebesar 15,60%, lebih tinggi dibandingkan sampel 5 V sebesar 3,19%, yang menunjukkan transformasi termal lebih signifikan pada sampel 2 V, sedangkan sampel 5 V memiliki stabilitas termal yang lebih tinggi. Berdasarkan hasil penelitian, dapat disimpulkan bahwa variasi tegangan berpengaruh terhadap pembentukan fase, ukuran kristalit, morfologi, komposisi unsur, dan karakteristik termal nanopartikel besi oksida hasil sintesis metode elektrolisis.
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Iron oxide nanoparticles are among the most extensively studied nanomaterials because they exhibit various crystalline phases with distinct structural, magnetic, and thermal properties, making them promising materials for applications in environmental remediation, energy, healthcare, catalysis, and sensing. This study aimed to investigate the effect of applied voltage on the phase formation and thermal transformation of iron oxide nanoparticles synthesized using the electrolysis method. The nanoparticles were synthesized using an iron electrode and a 0.01 M Na₂SO₄ electrolyte at applied voltages of 1, 2, 3, 4, and 5 V for 2 h. The synthesized products were characterized using X-ray Diffraction (XRD) to identify the crystalline phases and crystallite sizes, Simultaneous Thermal Analysis (STA) to evaluate their thermal behavior, and Scanning Electron Microscopy–Energy Dispersive X-ray Spectroscopy (SEM–EDX) to analyze their morphology and elemental composition. The results showed that increasing the applied voltage influenced the phase formation and characteristics of the iron oxide nanoparticles, as indicated by the increased amount of precipitate, magnetic response, crystallite size, changes in morphology, elemental composition, and thermal behavior. XRD analysis revealed that the samples synthesized at 1 V and 2 V were predominantly composed of lepidocrocite (γ-FeOOH), whereas the sample synthesized at 5 V was dominated by magnetite (Fe₃O₄), with crystallite sizes of 5.6 nm, 16.3 nm, and 31.4 nm, respectively. SEM–EDX analysis showed that the γ-FeOOH sample exhibited a flake-like aggregated morphology, while the Fe₃O₄ sample displayed a more compact granular morphology, and confirmed that Fe and O were the major constituent elements with a homogeneous distribution throughout the material. STA analysis indicated that the 2 V sample exhibited a cumulative weight loss of 15.60%, which was higher than that of the 5 V sample (3.19%), indicating a more significant thermal transformation, whereas the 5 V sample exhibited higher thermal stability. Overall, the applied voltage significantly affected the phase formation, crystallite size, morphology, elemental composition, and thermal characteristics of the iron oxide nanoparticles synthesized by the electrolysis method.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Elektrolisis, Nanopartikel Besi Oksida, Variasi Tegangan, Pembentukan Fase, Transformasi Termal. Electrolysis, Iron Oxide Nanoparticles, Voltage Variation, Phase Formation, Thermal Transformation. |
| Subjects: | Q Science Q Science > QD Chemistry > QD1 Oxidation-reduction reaction. Q Science > QD Chemistry > QD115 Electrochemical analysis Q Science > QD Chemistry > QD553 Electrochemistry. Electrolysis Q Science > QD Chemistry > QD75.2 Chemistry, Analytic Q Science > QD Chemistry > QD79.T38 Thermal analysis |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis |
| Depositing User: | Ananda Nur Shofiqoh |
| Date Deposited: | 04 Aug 2026 08:09 |
| Last Modified: | 04 Aug 2026 08:09 |
| URI: | http://repository.its.ac.id/id/eprint/143727 |
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