Abstract
The thermal reactions induced in C nanoparticles films deposited on Si substrates were followed by high resolution C 1s and Si 2p core level spectroscopy. These particles, when annealed at ∼1300 K transform into single wall carbon nanotubes [Appl. Phys. Lett. 80 (2002) 1441; Chem. Phys. Lett. 355 (2002) 395]. With increasing temperature a progressive re-hybridization of the sp 3 into the sp 2 carbon phase was observed. At 1270 K the C 1s core level showed a major component at 284.29 eV related to the graphitic tubes, and minor one at 283.75 eV, attributed to CSi bonds at the interface, which however do not seem to participate in the nanotube self-assembling. A strong reaction between Si atoms evaporated from the substrate and nanotube walls was observed at 1400 K, which led to the formation of stoichiometric SiC, occurring as a site-confined reaction.
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