Physics – Condensed Matter – Materials Science
Scientific paper
2007-03-27
Physics
Condensed Matter
Materials Science
14 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.98.216103
We report the production and characterization of a form of amorphous carbon films with sp/sp2 hybridization (atomic fraction of sp hybridized species > 20%) where the predominant sp bonding appears to be (=C=C=)n cumulene. Vibrational and electronic properties have been studied by in situ Raman spectroscopy and electrical conductivity measurements. Cumulenic chains are substantially stable for temperatures lower than 250 K and they influence the electrical transport properties of the sp/sp2 carbon through a self-doping mechanism by pinning the Fermi level closer to one of the mobility gap edges. Upon heating above 250 K the cumulenic species decay to form graphitic nanodomains embedded in the sp2 amorphous matrix thus reducing the activation energy of the material. This is the first example of a pure carbon system where the sp hybridization influences bulk properties.
Baserga Andrea
Bassi Andrea Li
Bongiorno G.
Bottani Carlo E.
Bruzzi Mara
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