Physics – Condensed Matter – Materials Science
Scientific paper
2005-01-14
Physics
Condensed Matter
Materials Science
13 pages, 4 figures
Scientific paper
10.1088/1367-2630/7/1/081
We report the experimental and theoretical investigation of the growth and of the structure of large carbon clusters produced in a supersonic expansion by a pulsed microplasma source. The absence of a significant thermal annealing during the cluster growth causes the formation of disordered structures where sp2 and sp hybridizations coexist for particles larger than roughly 90 atoms. Among different structures we recognize sp2 closed networks encaging sp chains. This "nutshell" configuration can prevent the fragmentation of sp species upon deposition of the clusters thus allowing the formation of nanostructured films containing carbynoid species, as shown by Raman spectroscopy. Atomistic simulations confirm that the observed Raman spectra are the signature of the sp/sp2 hybridization characteristic of the isolated clusters and surviving in the film and provide information about the structure of the sp chains. Endohedral sp chains in sp2 cages represent a novel way in which carbon nanostructures may be organized with potential interesting functional properties.
Barborini E.
Baserga Andrea
Bassi Andrea Li
Bogana M.
Bottani Carlo E.
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