Dual Raman features of double coaxial carbon nanotubes with N-doped and B-doped multiwalls.

Yang, Quan-Hong; Hou, Peng-Xiang; Unno, Masashi; Yamauchi, Seigo; Saito, Riichiro; Kyotani, Takashi · Nano Lett · 2005

basic_science · Level V

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Abstract

Double coaxial carbon nanotubes with nitrogen (N)-doped and boron (B)-doped multiwalls possess composite Raman characteristics, originating not only from the outer N-doped but also from inner B-doped layers. Both N and B dopings result in substantial shifts of the characteristic D band and G band of sp(2) carbon constituting nanotube walls but in different ways. The downshift of the G band is correlated with the decreases of electrical resistivity of carbon nanotubes regardless of N or B doping.

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