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Preparation and Electrical Properties of the MWNT/Polymer Nanocomposite Fibers

Published online by Cambridge University Press:  01 February 2011

Guan Wang ,
Zhongkui Tan ,
Xueqing Liu ,
Vladimir Samuilov  and
Michael Dudley
Guan Wang
Affiliation:
guwang@ic.sunysb.edu, Stony Brook University, Materials Science and Engineering, Dept. of Materials Science and Engineering, Stony Brook University, Stony Brook, NY, 11794, United States, 631-632-8501
Zhongkui Tan
Affiliation:
ztan@grad.physics.sunysb.edu, Stony Brook University, Department of Physics and Astronomy, Stony Brook, NY, 11794, United States
Xueqing Liu
Affiliation:
xliu@grad.physics.sunysb.edu, Stony Brook University, Department of Physics and Astronomy, Stony Brook, NY, 11794, United States
Vladimir Samuilov
Affiliation:
Vladimir.Samuilov@stonybrook.edu, Stony Brook University, Department of Materials Science and Engineering, Stony Brook, NY, 11794, United States
Michael Dudley
Affiliation:
mdudley@notes.cc.sunysb.edu, Stony Brook University, Department of Materials Science and Engineering, Stony Brook, NY, 11794, United States
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Abstract

An oxidation method has been applied to functionalize multiwalled carbon nanotubes with carboxylic acid (-COOH) group. Functionalized carbon nanotubes (f-MWNT) were used for the fabrication of conducting nanocomposite fibers by electrospinning, in comparison with the composite nanofibers made of un-functionalized carbon nanotubes (u-MWNT). Our results showed that the addition of f-MWNTs into polymer solution could increase the compatibility of MWNTs with the polymer matrix, and thus result in composite nanofibers with uniform diameters. Alignment of the composite nanofibers was achieved by using a rotating drum as the collector. F-MWNTs were found to align parallel to the axis direction of the nanofibers. Temperature-dependent DC electrical properties of a single composite fiber were investigated by a two-probe method. It was shown that the conductivity of the material could be significantly improved above a percolation threshold. The conductivity could be of ten orders of magnitude higher than the pure PVAc.

Keywords

nanoscaleelectrical propertiescomposite
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 963: Symposium Q – Nanowires and Carbon Nanotubes – Science and Applications , 2006 , 0963-Q20-24
Copyright
Copyright © Materials Research Society 2007

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