Abstract
In this paper the luminescence and Raman investigations of structural changes undergoing in C60/C70+Ni films annealed at vacuum are presented. Because of the annealing process of these films, multishell carbon nanotubes were obtained. The structural changes occurring in the films in various thermal conditions were observed by photoluminescence (PL) and Raman spectra.In room temperature Raman spectrum of air exposed “as grown” C60/C70+Ni films only C60 and C70 vibrational bands were found. The bands connected to graphite (∼1340, 1580 and 1620cm−1) and nanotubes (1565cm−1) vibrations were observed in Raman spectra of annealed films.In the PL spectrum of “as grown” C60/C70+Ni films three PL peaks were observed. In PL spectra of annealed layers (at 620 and 770K containing nanotubes) an additional PL peak at 11,940cm−1 was found. This peak could be attributed to a transition between vibronic states of carbon. In the PL spectra of annealed films, no shift of PL peaks was observed with increasing measurement's temperature (from 6 to 300K).
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