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© Research
Publication : The journal of physical chemistry. B

Fabrication and magnetic properties of Ni nanospheres encapsulated in a fullerene-like carbon

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The journal of physical chemistry. B - 19 May 2005

Pol SV, Pol VG, Frydman A, Churilov GN, Gedanken A

Link to Pubmed [PMID] – 16852141

J Phys Chem B 2005 May;109(19):9495-8

A very simple, efficient, and economical synthetic technique, which produces fascinating fullerene-like Ni-C (graphitic) core-shell nanostructures at a relatively low temperature, is reported. The thermal dissociation of Ni acetylacetonate is carried out in a closed vessel cell (Swagelok) that was heated at 700 degrees C for 3 h. The encapsulation of ferromagnetic Ni nanospheres into the onion structured graphitic layers is obtained in a one-stage, single precursor reaction, without a catalyst, that possesses interesting magnetic properties. The magnetoresistance (MR) property of Ni nanospheres encapsulated in a fullerene-like carbon was measured, which shows large negative MR, of the order of 10%. The proposed mechanism for the formation of the Ni-C core-shell system is based on the segregation and the surface flux formed in the Ni and carbon particles during the reaction under autogenic pressure at elevated temperature.

https://www.ncbi.nlm.nih.gov/pubmed/16852141