  The Raman response of new structures grown after filling SWCNTs with
ferrocene and transformation at moderate high temperatures is demonstrated to
be very strong, even stronger than the response from the tubes. Transmission
electron microscopy demonstrates that the new objects are flat and exhibit a
structure similar to short fragments of nanoribbons. The growth process is
controlled by two different activation energies for low and high transformation
temperatures, respectively. Immediately after filling Raman pattern from a
precursor molecule are detected. Two different types of nanoribbons were
identified by selecting special laser energies for the Raman excitation. These
ribbons have the signature of quaterrylene and terrylene, respectively.
