NOVA NUR ELISA DEWI, . (2025) STUDI STRUKTUR KRISTAL DAN SIFAT LISTRIK MATERIAL NANO PEROVSKITE La1-xMgxFeO3 (x=0.0, 0.1, dan 0.3) UNTUK APLIKASI SENSOR KELEMBAPAN. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.
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Abstract
Pada penelitian ini bertujuan untuk menyintesis dan mengkarakterisasi material nano perovskite La1-xMgxFeO3 (x=0.0, 0.1, dan 0.3) sebagai aplikasi sensor kelembapan. Sintesis material nano perovskite La1-xMgxFeO3 (x=0.0, 0.1, dan 0.3) telah berhasil dilakukan dan menghasilkan partikel yang homogen. Substitusi Mg ke situs-La dalam struktur LaFeO3 dilakukan untuk meningkatkan sensitivitas sensor terhadap kelembapan. Karakterisasi sampel dilakukan dengan menggunakan Scanning Electron Microscope- Energy Dispersive X-Ray (SEM-EDX), X-Ray Flouresensi dan X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Ultra Violet Visible Spectroscopy (UV – Vis), CKT 5000 LCR Meter digunakan untuk uji pengindraan sensor kelembapan berdasarkan sifat listrik. Hasil karakterisasi XRD menunjukkan bahwa seluruh sampel berfasa tunggal dengan struktur kristal orthorhombic dan ruang grup Pn m a, serta terjadi perubahan parameter kisi akibat substitusi Mg. Peningkatan nilai bond distance dan bond angles dari hasil karakterisasi XRD dikonfirmasi oleh pengujian FTIR. Karakterisasi morfologi menggunakan SEM-EDX menunjukkan perubahan distribusi dan ukuran partikel, dengan La0.9Mg0.1FeO3 memiliki distribusi partikel yang seragam dan ukuran butir terbesar yaitu 210 nm. Komposisi untuk utama seperti La, Mg, Fe, O terdeteksi dengan baik melalui EDX dan XRF. Hasil karakterisasi UV-Vis menunjukkan penurunan band gap energy seiring peningkatan substitusi Mg di situs-La pada LaFeO3. Uji listrik dan kapasitansi menunjukkan bahwa ketiga sensor memberikan respons terhadap variasi kelembapan relatif (RH), dengan La0.9Mg0.1FeO3 menunjukkan sensitivitas tertinggi dan histerisis sebesar 7.09% pada frekuensi 50 Hz. Hal ini mengindikasikan jika peningkatan performa sensor kelembapan berhasil dicapai melalui sensor La0.9Mg0.1FeO3 yang menghasilkan struktur, morfologi, sifat optik, dan sifat listrik yang paling optimal. Kata kunci. LaFeO3, Sensor Kelembapan, Substitusi pada situs-A, Sol-gel, Struktur Perovskite. /**** This study aims to synthesize and characterize the nano perovskite material La1-xMgxFeO3 (x=0.0, 0.1, dan 0.3) for potential application in humidity sensors. The materials were successfully synthesized using the sol-gel method, resulting in homogeneous nano-sized particles. Magnesium was substituted at the A-site (La) to enhance the humidity sensitivity of the material. Structural and morphological properties were analyzed using X-ray diffraction (XRD), Scanning Electron Microscopy coupled with Energy Dispersive X-ray spectroscopy (SEM-EDX), X-ray Fluorescence (XRF), Fourier Transform Infrared Spectroscopy (FTIR), and UV-Vis spectroscopy. The electrical properties and sensing performance were evaluated using a CKT 5000 LCR meter. XRD analysis confirmed single-phase orthorhombic structures with space group Pn m a in all samples. Mg substitution influenced the lattice parameters and increased bond distances and bond angles, which were further validated by FTIR spectra. SEM-EDX analysis showed that La0.9Mg0.1FeO3, exhibited the most uniform particle distribution with the largest grain size of 210 nm. The presence of La, Mg, Fe, and O was confirmed through EDX and XRF analyses. UV-Vis analysis revealed a decrase in the optical band gap energy with increasing Mg substitutions at the La-site in LaFeO3. Capacitance based humidity sensing tests demonstrated that all compositions responded to changes in relative humidity (RH), with La0.9Mg0.1FeO3 exhibiting the highest sensitivity and a hysteresis value of 7.09% at 50 Hz. These findings indicate that the 0.1 Mg-substituted composition offers the most optimal performance in terms of structure, morphology, optical, and electrical characteristics for humidity sensing applications. Keywords. LaFeO3, Humidity Sensor, A-site Substitution, Sol-Gel, Perovskite Structure.
Item Type: | Thesis (Sarjana) |
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Additional Information: | 1). Prof. Dr. Iwan Sugihartono, M.Si. 2). Prof. Dr. techn. Djoko Triyono, M.Si. |
Subjects: | Sains > Fisika |
Divisions: | FMIPA > S1 Fisika |
Depositing User: | Nova Nur Elisa Dewi . |
Date Deposited: | 21 Aug 2025 03:34 |
Last Modified: | 21 Aug 2025 03:34 |
URI: | http://repository.unj.ac.id/id/eprint/61763 |
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