Effect of ion irradiation on structure and thermal evolution of the Ni-C-60 hybrid systems

0346857 - ÚJF 2011 RIV NL eng J - Journal Article
Vacík, Jiří - Lavrentiev, Vasyl - Vorlíček, Vladimír - Bačáková, Lucie - Narumi, K.
Effect of ion irradiation on structure and thermal evolution of the Ni-C-60 hybrid systems.
Nuclear Instruments & Methods in Physics Research Section B. Roč. 268, 11-12 (2010), s. 1976-1979. ISSN 0168-583X. E-ISSN 1872-9584.
[19th International conference on Ion beam analysis. Cambridge, 07.09.2009-11.09.2009]
R&D Projects: GA AV ČR IAA200480702; GA AV ČR IAA400100701; GA AV ČR(CZ) KAN400480701; GA MŠMT(CZ) LC06041
Institutional research plan: CEZ:AV0Z10480505; CEZ:AV0Z10100520; CEZ:AV0Z50110509
Keywords : Ion irradiation * Fullerenes * Nickel
Subject RIV: JI - Composite Materials
Impact factor: 1.042, year: 2010

We report on the thermal response of the transition metal/fullerene thin hybrid multilayers, pristine and ion-modified, i.e., Ni/C-60/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 degrees C. At temperatures around (and above) 500 degrees C fullerenes underwent (in the vicinity of Ni) massive fragmentation and conversion to a-C. Very high temperature (1000 degrees C) annealing resulted in the fabrication of an array of micrometer-sized octagonal pits and rod-type particles emerging from the encompassing a-C + Ni mixture.
Permanent Link: http://hdl.handle.net/11104/0187772