Transport and magnetic properties of multiwall carbon nanotubes before and after bromination |
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| Authors: | A. I. Romanenko O. B. Anikeeva A. V. Okotrub L. G. Bulusheva N. F. Yudanov C. Dong Y. Ni |
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| Affiliation: | (1) Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences, pr. Akademika Lavrent’eva 3, Novosibirsk, 630090, Russia;(2) Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;(3) Novosibirsk State Technical University, Novosibirsk, 630092, Russia;(4) National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Science, Beijing, 100080, China |
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| Abstract: | Bulk samples of oriented carbon nanotubes were prepared by electric arc evaporation of graphite in a helium environment. The temperature dependence of the conductivity σ(T), as well as the temperature and field dependences of the magnetic susceptibility χ(T, B) and magnetoresistance ρ(B, T), was measured for both the pristine and brominated samples. The pristine samples exhibit an anisotropy in the conductivity σ∥(T)/σ⊥>50, which disappears in the brominated samples. The χ(T, B) data were used to estimate the carrier concentration n 0 in the samples: n 0ini ～3×1010 cm?2 for the pristine sample, and n 0Br～1011 cmt—2 for the brominated sample. Estimation of the total carrier concentration n=n e+n p from the data on ρ(B, T) yields n ini=4×1017 cm?3 (or 1.3×1010 cm?2) and n Br=2×1018 cm?3 (or 6.7×1010 cm?2). These estimates are in good agreement with one another and indicate an approximately fourfold increase in carrier concentration in samples after bromination. |
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