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Synthesis, magnetic and optical properties of core/shell Co(1-x)Zn(x)Fe(2)O(4)/SiO(2) nanoparticles
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
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2011 (English)In: Nanoscale Research Letters, ISSN 1931-7573, E-ISSN 1556-276X, Vol. 6, 460- p.Article in journal (Refereed) Published
Abstract [en]

The optical properties of multi-functionalized cobalt ferrite (CoFe(2)O(4)), cobalt zinc ferrite (Co(0.5)Zn(0.5)Fe(2)O(4)), and zinc ferrite (ZnFe(2)O(4)) nanoparticles have been enhanced by coating them with silica shell using a modified Stober method. The ferrites nanoparticles were prepared by a modified citrate gel technique. These core/shell ferrites nanoparticles have been fired at temperatures: 400 degrees C, 600 degrees C and 800 degrees C, respectively, for 2 h. The composition, phase, and morphology of the prepared core/shell ferrites nanoparticles were determined by X-ray diffraction and transmission electron microscopy, respectively. The diffuse reflectance and magnetic properties of the core/shell ferrites nanoparticles at room temperature were investigated using UV/VIS double-beam spectrophotometer and vibrating sample magnetometer, respectively. It was found that, by increasing the firing temperature from 400 degrees C to 800 degrees C, the average crystallite size of the core/shell ferrites nanoparticles increases. The cobalt ferrite nanoparticles fired at temperature 800 degrees C; show the highest saturation magnetization while the zinc ferrite nanoparticles coated with silica shell shows the highest diffuse reflectance. On the other hand, core/shell zinc ferrite/silica nanoparticles fired at 400 degrees C show a ferromagnetic behavior and high diffuse reflectance when compared with all the uncoated or coated ferrites nanoparticles. These characteristics of core/shell zinc ferrite/silica nanostructures make them promising candidates for magneto-optical nanodevice applications.

Place, publisher, year, edition, pages
2011. Vol. 6, 460- p.
Keyword [en]
nanostructures, oxides, cobalt ferrite, cobalt zinc ferrite, zinc ferrite, magnetic properties, diffuse reflectance
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-38144DOI: 10.1186/1556-276X-6-460ISI: 000293415700002Scopus ID: 2-s2.0-84856063498OAI: oai:DiVA.org:kth-38144DiVA: diva2:436321
Note
QC 20110823Available from: 2011-08-23 Created: 2011-08-22 Last updated: 2017-12-08Bibliographically approved

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