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1 Materials Science Poland

1 2006

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Cobalt nanoparticles processed by thermal decomposition of metal containing monomer

Sówka E., Leonowicz M., Andrzejewski B., Pomogailo A.D., Dzhardimalieva G.I.

Materials Science Poland

2006

Vol. 24, No. 2/1

311--317

Polymer matrix ferromagnetic nanocomposites, containing Co nanocrystallites, were processed by an innovative fabrication method using frontal polymerisation of cobalt acrylamid (AAm) complex, followed by subsequent thermolysis at temperatures 873 and 1073 K. The thermolysis products were in the form of irregular powder particles having broad range of size distribution, from 10 up to 300 žm. The powder particles contained nanocrystallites of Co having mean size in the range 12-15 nm, depending on the thermolysis temperature. The hysteresis loops recorded for materials processed at 873 and 1073 K, respectively proved that the coercivity depends on the processing temperature and very slightly on the measurement temperature. The thermolysis product, processed at 873 K, showed soft magnetic properties. The particles were randomly distributed and their size and agglomeration can be controlled by the processing variables.