Synthesis and characterization of Fe3O4nS and Fe3O4unS core-shell nanoparticles

In the present work we report new assets on the synthesis and characterization of magnetite based core-shell nanoparticles such as Fe3O4nS and Fe3O4unS. The composites were prepared by seed mediated growth which consist in a sequential growth of a second or third component on a preformed magnetite s...

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Bibliographic Details
Published in:Applied surface science 2014-01, Vol.288, p.180-192
Main Authors: Stefan, M, Leostean, C, Pana, O, Soran, M-L, Suciu, R C, Gautron, E, Chauvet, O
Format: Article
Language:English
Subjects:
Agglomeration
Magnetite
Magnetization
Nanoparticles
Seeds
Sodium
Synthesis
Zinc sulfides
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Summary:In the present work we report new assets on the synthesis and characterization of magnetite based core-shell nanoparticles such as Fe3O4nS and Fe3O4unS. The composites were prepared by seed mediated growth which consist in a sequential growth of a second or third component on a preformed magnetite seeds in the presence of sodium laurylsulphate additives with essential role in growth and aggregation of nanoparticles. Evolved gas analysis (EGA) coupled with FT-IR was used in order to evidence the stages of ZnS shell formation. XRD studies were used for the structural characterization while high resolution transmission electron microscopy gave information concerning morphology and size distributions of nanoparticles. Qualitative and quantitative compositional analysis of samples was made by X-ray photoelectron spectroscopy (XPS). All the samples showed magnetic response due to the superparamagnetic behavior of magnetite cores. Increased saturation magnetization was determined for Fe3O4nS samples. A significant photoluminescence (PL) enhancement was also observed as a result of Fe3O4_Zn2+ molar ratio decrease. Additional PL increased response was realized by inserting a gold shell between the magnetite core and ZnS outer shell. Considerations regarding both PL and magnetization enhancements are also presented.
ISSN:0169-4332
DOI:10.1016/j.apsusc.2013.10.005