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Electronic properties of carbon nanotube

Abstract The electronic properties of purified carbon nanotube (multicylinder structure with an outer diameter of ≈ 20 nm and a length of ≈ 10 μm) was first examined based on the electron spin resonance (ESR) spectroscopy. By the Raman scattering measurement, only one peak at 1581 cm −1 similar to that of graphite was found. The purified nanotube was almost ESR silent as well as the K- and the I 2 -doped samples. This indicates that the purified nanotube examined in the present study is a ‘clean’ semiconductor almost without magnetic impurity and is doping inactive.