Structural Consequences of Duplicitous Chemical Relation of Cobalt and Fullerene in Mixture

0384958 - ÚJF 2013 RIV US eng J - Journal Article
Lavrentiev, Vasyl - Vacík, Jiří - Naramoto, H.
Structural Consequences of Duplicitous Chemical Relation of Cobalt and Fullerene in Mixture.
Fullerenes, Nanotubes, and Carbon Nanostructures. Roč. 20, 4-7 (2012), s. 328-335. ISSN 1536-383X. E-ISSN 1536-4046
R&D Projects: GA AV ČR(CZ) KAN400480701; GA ČR GA106/09/1264; GA ČR GAP107/11/1856
Institutional support: RVO:61389005
Keywords : fullerene * cobalt * chemical bonding * nanostructure * self-organization
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 0.764, year: 2012

The factors driving the structure organization in the Co-C-60 films fabricated by simultaneous deposition were analyzed. It is shown that phase separation is the major factor yielding the nanocomposite (NC) structure in the co-deposited film (fcc-Co nanocrystals immersed into C-60-based matrix). The phase separation is accompanied by accumulation of compressive stress in the film mixture. The metal-fullerene chemical bonding is the next important factor responsible for creation of the -Co-C-60- polymer in the NC matrix. Thermal treatment can significantly influence the structure organization through enhancement of the main factors (phase separation or chemical bonding) that yields the remarkable structural effects. In particular, annealing at the elevated temperatures (T-a = 300-500 degrees C) induces the regular carbon structure transformations in the NC matrix followed by creation of carbon nanotubes or graphitic-like shells (depending on T-a). The C-structure transformation is controlled by catalytic effect of Co atoms retaining in the NC matrix.
Permanent Link: http://hdl.handle.net/11104/0214402