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,/spl sigma/, was measured at temperatures between 1.9 and
300 K and transverse magnetic field between-9 and 9 T. Zero magnetic field conductivity/spl
sigma/(0, T) was found to increase monotonically with the temperature with a convex/spl
sigma/(0, T) versus T curve. Conductivity increases with the external transverse magnetic …

We have measured the electronic transport properties of PAN based nano-fibers obtained
by electrostatic deposition from 1.9 K to room temperature and carefully fitted the
temperature and magnetic field dependence of these measurements to pertinent theoretical
models It is noteworthy that the anomalous temperature and magnetic field dependence of
conductivity have been found in carbon fibers with diameter larger than 10 microns, and
mostly, carbonized at heat treatment temperature (HTT) higher than 1000° C. It is interesting …