Departmental Papers (ESE)

Document Type

Journal Article

Date of this Version

March 2004

Comments

Copyright 2004 IEEE. Reprinted from IEEE Transactions on Nanotechnology, Volume 3, Issue 1, March 2004, pages 80-85.
Publisher URL: http://ieeexplore.ieee.org/xpl/tocresult.jsp?isNumber=28578&page=1

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Abstract

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.

Keywords

Electronic transport, electrospinning, graphitic domains, magnetoresistance, nanofibers

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Date Posted: 09 November 2004

This document has been peer reviewed.