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Nondispersive Raman lines in the D‐band region for ferrocene functionalized carbon nanotubes
Author(s) -
Kuzmany H.,
Shi L.,
Pichler T.,
Kramberger C.,
Chernov A.,
Liu X.
Publication year - 2014
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201451214
Subject(s) - ferrocene , raman spectroscopy , materials science , resonance (particle physics) , excitation , deuterium , d band , dispersion (optics) , carbon nanotube , molecular electronic transition , g band , analytical chemistry (journal) , nanotechnology , chemistry , optics , atomic physics , organic chemistry , molecule , physics , electrochemistry , electrode , quantum mechanics
Carbon‐rich fillers like ferrocene can be transformed into an inner tube with extremely small diameter if they are filled into HiPco tubes. For ferrocene@HiPco three new Raman bands appear in the D‐band region during this transformation. These bands do not show dispersion and exhibit a strong resonance for red laser excitation. The observed resonance is for the outgoing phonon at 1247 cm− 1for an electronic transition at 1.84 eV. Maximum response for the new lines is observed for transformation of the filled tubes between 800 and 900 ° C. In addition to the three bands in the D‐band region also an enhanced band at 470 cm− 1is observed with the same sensitivity to transformation temperature. In order to obtain more information on the origin of the new bands deuterium substituted FeCp2 was used. The new lines turned out to be sensitive to this substitution which is considered as a strong indication of their origin from organic compounds created inside or in between the tubes during the transformation process.