Abstract
Abstract We report on the thermal response of the transition metal/fullerene thin hybrid multilayers, pristine and ion-modified, i.e., Ni/C60/Ni and Ni/a-C/Ni (a-C amorphous carbon), both prepared on the MgO(1 0 0) monocrystalline substrate. The multilayer sequences were gradually annealed up to high temperatures and their structures were inspected using several analytical techniques. The inspection evidenced differences in the evolution of the virgin and ion-irradiated systems. In pristine (non-irradiated) composites (analyzed in the previous experiment) a significant part of the fullerene molecules out-diffused during annealing 500 °C, however, induced a forceful phase separation. The nominal annealing at 1000 °C resulted in the formation of facetted, sub-micrometer-sized (round, plate and rod-type) particles (with a Ni core and a thin a-C rind) that were spread individually (without a complex a-C + Ni matrix) on a thin a-C/MgO(1 0 0) interface. The main axes of the particles were oriented according to the crystallographic axis of the MgO(1 0 0) substrate.
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