Absorption of microwave radiation by nanosize cobalt clusters embedded in amorphous carbon

A contribution is investigating of nanosize clusters to absorption of electromagnetic radiation of microwave spectral range by amorphous carbon modified with cobalt. To this end a modification by thermal annealing of pair of nanosize fragments of graphene planes intercalated with cobalt was studied. The study was performed by Car-Parrinello molecular dynamics. It was found that atoms of cobalt have trend to coagulate in a spherical drop enveloping by a carbon cage forming as a result of transformation of graphene planes under influence of temperature. Estimation was performed of absorbance of such clusters and it is shown that metallic nanoparticles of two types embedded in amorphous carbon might be responsible for absorption of the microwave electromagnetic radiation: flat discs and needles.