NDLI: Study of Structural and Magnetic Properties of Superparamagnetic Fe$_{3}$O$

Content Provider	Springer Nature Link
Author	Ahadpour Shal, Alireza Jafari, Atefeh
Copyright Year	2014
Abstract	In this work, Fe$_{3}$O$_{4}$–ZnO core–shell nanoparticles have been successfully synthesized using a simple two-step co-precipitation method. In this regard, Fe$_{3}$O$_{4}$ (magnetite) and ZnO (zincite) nanoparticles (NPs) were synthesized separately. Then, the surface of the Fe$_{3}$O$_{4}$ NPs was modified with trisodium citrate in order to improve the attachment of ZnO NPs to the surface of Fe$_{3}$O$_{4}$ NPs. Afterwards, the modified magnetite NPs were coated with ZnO NPs. Moreover, the influence of the core to shell molar ratio on the structural and magnetic properties of the core–shell NPs has been investigated. The prepared nanoparticles have been characterized utilizing transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and vibrating sample magnetometer (VSM). The results of XRD indicate that Fe$_{3}$O$_{4}$ NPs with inverse spinel phase were formed. The results of VSM imply that the Fe$_{3}$O$_{4}$–ZnO core–shell NPs are superparamagnetic. The saturation magnetization of prepared Fe$_{3}$O$_{4}$ NPs is 54.24 emu/g and it decreases intensively down to 29.88, 10.51 and 5.75 emu/g, after ZnO coating with various ratios of core to shell as 1:1, 1:10 and 1:20, respectively. This reduction is attributed to core–shell interface effects and shielding. TEM images and XRD results imply that ZnO-coated magnetite NPs are formed. According to the TEM images, the estimated average size for most of core–shell NPs is about 12 nm.
Starting Page	1531
Ending Page	1538
Page Count	8
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	27
Issue Number	6
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2014-01-08
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fe$_{3}$O$_{4}$ ZnO Core–shell Nanoparticle Superparamagnetic Strongly Correlated Systems, Superconductivity Magnetism, Magnetic Materials Condensed Matter Physics Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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