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http://dx.doi.org/10.4313/JKEM.2008.21.2.118

Encapsulation of Fullerenes in Single-walled Carbon Nanotubes and their Characteristic Analysis by Raman Spectroscopy  

Goak, Jeung-Choon (세종대학교 나노공학과)
Lee, Nae-Sung (세종대학교 나노공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.21, no.2, 2008 , pp. 118-125 More about this Journal
Abstract
Single walled carbon nanotubes (SWCNTs) can be modified to produce a new concept of hybrid materials by introducing atoms or molecules inside their cylindrical empty space. Such an endohedral doping of the SWCNTs is expected to decisively alter their electronic transport and mechanical properties, In this study, we purified SWCNTs by three-step purification processes and formed the peapod structure by introducing $C_{60}$ fullerenes inside the SWCNTs. $C_{60}$ molecules were observed to be regularly arranged by transmission electron microscopy. In Raman spectra, the radial breathing mode (RBM) rather than the other modes was significantly affected by the endohedral injection of $C_{60}$. The RBM intensity was more greatly reduced in the large-diameter SWCNTs than the small-diameter ones, Raman spectroscopy is expected to be a key technique for analyzing $C_{60}$-encapsulated SWCNTs.
Keywords
Single walled carbon nanotubes; Fullerene; Endohedral encapsulation; Purification; Peapod;
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