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Electronic transport properties of incipient graphitic domains formation in PAN derived carbon nanofibers

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4 Author(s)
Wang, Yu ; Dept. of Electr. Eng., Univ. of Pennsylvania, Philadelphia, PA, USA ; Ramos, I. ; Furlan, R. ; Santiago-Aviles, Jorge J.

The carbon nanofibers used in this work were derived from a polyacrylonitrile (PAN)/N, N-dimethyl formamide (DMF) precursor solution using electrospinning and vacuum pyrolysis techniques. Their conductivity, σ, was measured at temperatures between 1.9 and 300 K and transverse magnetic field between -9 and 9 T. Zero magnetic field conductivity σ(0,T) was found to increase monotonically with the temperature with a convex σ(0,T) versus T curve. Conductivity increases with the external transverse magnetic field, revealing a negative magnetoresistance at temperatures between 1.9 and 10 K, with a maximum magnetoresistance of -75 % at 1.9 K and 9 T. The magnetic field dependence of the conductivity and the temperature dependence of the zero-field conductivity are best described using the two-dimensional weak localization effect.

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Nanotechnology, IEEE Transactions on  (Volume:3 ,  Issue: 1 )