Abstract
We have studied the plasmon resonance behaviors of various multiwalled carbon nanotubes (MWCNTs) using far-infrared (FIR) spectroscopy. MWCNTs having high crystallinity showed clear FIR peak structures, the same as those observed in single-walled carbon nanotubes (SWCNTs). However, the FIR peak structures in defective MWCNTs were severely suppressed. The observed FIR peak positions apparently depend on the inverse of the MWCNT length. These results are consistent with the one-dimensional plasmon resonance model, which is sensitive to the geometrical structure of a CNT channel and the disturbance of the plasmon motion in the channels.
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