Effects of synthesis variables on the magnetic properties of CoFe₂O₄ nanoparticles

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• 作者：Sarah Briceñ ; o^a ; ^{sarahbriara@gmail.com} ; ^{sbriceno@ivic.gob.ve} ; Werner Brä ; mer-Escamilla^a ; Pedro Silva^a ; Gerzon E. Delgado^b ; Eric Plaza^c ; Jordana Palacios^d ; Edgard Cañ ; izales^e
• 关键词：Nanostructured material ; Chemical synthesis ; Magnetic measurement
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：September, 2012
• 卷：324
• 期：18
• 页码：2926-2931
• 文件大小：935 K

摘要

Cobalt ferrite nanoparticles (CoFe₂O₄) have been synthesized using precipitation in water solution with polyethylene glycol as surfactant. Influence of various synthesis variables included pH, reaction time and annealing temperature on the magnetic properties and particle sizes has also been studied. Structural identification of the samples was carried out using Thermogravimetric and Differential thermal analysis, X-ray diffraction, Fourier transform infrared spectroscopy, Scanning electron microscopy, High resolution transmission electron microscopy. Vibrating sample magnetometer was used for the magnetic investigation of the samples. Magnetic properties of nanoparticles show strong dependence on the particle size. The magnetic properties increase with pH of the precipitating medium and annealing temperature while the coercivity goes through a maximum, peaking at around 25 nm.