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F. Simon, H. Kuzmany, J. Bernardi, F. Hauke, A. Hirsch:
"Encapsulating C59N azafullerene derivatives inside single-wall carbon nanotubes";
Carbon, 44 (2006), 1958 - 1962.

Filling of single-wall carbon nanotubes with C59N azafullerene derivatives is reported from toluene solvent at ambient temperature.
The filling is characterized by high-resolution transmission electron microscopy and Raman spectroscopy. The filling efficiency is the
same as for C60 fullerenes and the tube-azafullerene interaction is similar to the tube-C60 interaction. Vacuum annealing of the encapsulated azafullerene results in the growth of inner tubes, however no spectroscopic signature of nitrogen built in the inner walls is detected.