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

S. V. Pol, V. G. Pol, A. Frydman, G. N. Churilov, A. Gedanken

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Abstract

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°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.

Original languageEnglish
Pages (from-to)9495-9498
Number of pages4
JournalJournal of Physical Chemistry B
Volume109
Issue number19
DOIs
StatePublished - 19 May 2005

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