Influence of electrical conductivity of multi-walled carbon nanotubes by halogen-doping

Abstract

Abstract: Multi-walled carbon nanotubes (MWNTs) were doped by chlorine, bromine and iodine. Compared with the pristine MWNTs, the electrical conductivities of Cl2-MWNT and Br2-MWNTs were improved over 5 times and 3 times, respectively, while that of I2-MWNTs almost unchanged. The interaction between the halogen and MWNTs was analyzed by Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). Meanwhile, we also studied the carrier concentration and carrier mobility which may affect the conductivities of the composite. The results show that: When the halogen electronegativity become stronger, the mean free path of the carrier of doped MWNTs will be higher, as well as the carrier mobility. And the stonger the interaction between the halogen and MWNTs become, the more carriers will take part in conducting, which means the carrier concentration will be higher.

Key words: MWNTs, halogen, carrier, mobility, concentration, conductivity

CLC Number:

Q948

SHI Guo-Xian XU Xue-Cheng. Influence of electrical conductivity of multi-walled carbon nanotubes by halogen-doping[J]. Journal of East China Normal University(Natural Sc, 2013, 2013(6): 120-126.

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