Comparative Study of MnFe₂ O ₄ Nanoparticles Synthesized by Sol-gel Method with Two Different Surfactants

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• 作者：Mary Jacintha ; P. Neeraja ; M. Sivakumar…
• 关键词：Nanoparticles ; Surfactant ; Magnetic properties ; Optical properties ; Catalytic properties
• 刊名：Journal of Superconductivity and Novel Magnetism
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：30
• 期：1
• 页码：237-242
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Strongly Correlated Systems, Superconductivity; Magnetism, Magnetic Materials; Condensed Matter Physics; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1557-1947
• 卷排序：30

文摘

Nanoparticles (NP) of MnFe₂O₄ were synthesized via sol-gel method, with calcination process at 600 °C. The effects of different surfactants namely polypropylene glycol (PPG) and polysorbate 80 (PS80) in the formation of crystal structure, magnetic properties, and optical properties were studied using X-ray diffraction (XRD), vibration sample magnetometry, UV-visible diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. Brunauer-Emmett-Teller (BET) surface area test was also performed. XRD investigations revealed that MnFe₂O₄ sample synthesized using PS80 as surfactant (sample 2) showed pure crystalline phase of a cubic spinel structure whereas sample synthesized with PPG (sample 1) exhibited an additional phase of α-Fe₂O₃. The morphology of the samples was recorded using a scanning electron microscope (SEM). Energy dispersive X-ray (EDX) results showed that the composition of the elements was as relevant as expected from the sol-gel method. The magnetic hysteresis loops confirmed the super-paramagnetic behavior of both the samples. PL studies revealed a sharp narrow band green emission exhibited by both the samples. Catalytic activity of MnFe₂O₄ nanoparticles (NPs) was performed. The catalysts MnFe₂O₄, samples 1 and 2, were tested for the oxidation of benzyl alcohol to benzaldehyde. The conversion of benzyl alcohol reached a maximum of 82.45 % for MnFe₂O₄ sample 2, whereas for sample 1, the conversion was only 68.52 %. These Mn ferrite samples have potential applications in LED or laser diodes.