Abstract

A study of 100 keV Co +-implanted C 60 films with Rutherford Backscattering and Raman spectroscopy has revealed the pronounced cobalt translation from the surface layer of amorphous carbon into the deeper crystalline fullerene due to post-implantation annealing at 300 °C. Carbon density gradient along the film depth is discussed as a driving force of this effect. Cobalt deficit in the doped fullerene layer, detected by means of ion beam analysis, suggests ionization of the C 60 molecules under the collisions with 2 MeV He + ions.

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