Photoluminescence (PL) behavior of peapod-derived double-walled carbon nanotubes (DWNTs)---the simplest form among multiwalled carbon nanotubes---is investigated. Even though the optical absorption and the resonant Raman spectra show the characteristic features of DWNTs, the PL signals originated from DWNTs are severely suppressed. This suppression is a consequence of an interlayer interaction between the inner and the outer tubes that efficiently quenches the PL signals of the DWNTs.
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Okazaki et al. (2006) studied this question.
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