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      • Role of Intertube Interactions in Double- and Triple-Walled Carbon Nanotubes

        Hirschmann, Thomas Ch.,Araujo, Paulo T.,Muramatsu, Hiroyuki,Rodriguez-Nieva, Joaquin F.,Seifert, Max,Nielsch, Kornelius,Kim, Yoong Ahm,Dresselhaus, Mildred S. American Chemical Society 2014 ACS NANO Vol.8 No.2

        <P>Resonant Raman spectroscopy studies are performed to access information about the intertube interactions and wall-to-wall distances in double- and triple-walled carbon nanotubes. Here, we explain how the surroundings of the nanotubes in a multiwalled system influence their radial breathing modes. Of particular interest, the innermost tubes in double- and triple-walled carbon nanotube systems are shown to be significantly shielded from environmental interactions, except for those coming from the intertube interaction with their own respective host tubes. From a comparison of the Raman results for bundled as well as individual fullerene-peapod-derived double- and triple-walled carbon nanotubes, we observe that metallic innermost tubes, when compared to their semiconducting counterparts, clearly show weaker intertube interactions. Additionally, we discuss a correlation between the wall-to-wall distances and the frequency upshifts of the radial breathing modes observed for the innermost tubes in individual double- and triple-walled carbon nanotubes. All results allow us to contemplate fundamental properties related to DWNTs and TWNTs, as for example diameter- and chirality-dependent intertube interactions. We also discuss differences in fullerene-peapod-derived and chemical vapor deposition grown double- and triple-walled systems with the focus on mechanical coupling and interference effects.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-2/nn500420s/production/images/medium/nn-2014-00420s_0008.eps'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn500420s'>ACS Electronic Supporting Info</A></P>

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