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Raman spectroscopy and spectroelectrochemistry of the chemically n‐doped DWCNT
Author(s) -
Kalbac M.,
Kavan L.,
Zukalova M.,
Dunsch L.
Publication year - 2007
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.200776165
Subject(s) - raman spectroscopy , doping , dopant , potassium , carbon nanotube , analytical chemistry (journal) , electrochemistry , spectroscopy , chemistry , resonance (particle physics) , materials science , nanotechnology , optoelectronics , electrode , organic chemistry , optics , atomic physics , physics , quantum mechanics
Abstract The Raman spectroscopy and in situ Raman spectroelectrochemistry have been employed to evaluate the state of chemical dopants in the inner space of potassium vapor treated double walled carbon nanotubes (DWCNT) for samples heavily doped. The high doping level was confirmed by the disappearance of the radial breathing mode (RBM) signal of the outer tubes. The RBMs of inner tubes are still detected even after heavy doping. Furthermore the Raman spectra of doped samples show the RBM of inner tubes, which were not in resonance for undoped sample. The removal of potassium from doped DWCNT led to an almost complete recovery of the DWCNT spectra. The possible presence of potassium inside DWCNT has been investigated by electrochemical charging after a treatment of the sample with water. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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