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Heat treating carbon nanofibers for optimal composite performance

Published online by Cambridge University Press:  03 March 2011

J.Y. Howe ,
G.G. Tibbetts ,
C. Kwag  and
M.L. Lake
J.Y. Howe*
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
G.G. Tibbetts
Affiliation:
Applied Sciences, Inc., Cedarville, Ohio 45314
C. Kwag
Affiliation:
Applied Sciences, Inc., Cedarville, Ohio 45314
M.L. Lake
Affiliation:
Applied Sciences, Inc., Cedarville, Ohio 45314
*
a) Address all correspondence to this author. e-mail: howej@ornl.gov
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Abstract

Partial graphitization of carbon nanofibers by high-temperature heat treatment can give improved composite properties. The intrinsic electrical conductivity of the bulk carbon nanofibers measured under compression is maximized by giving the fibers an initial heat treatment at 1500 °C. Similarly, for carbon nanofiber/polypropylene composites containing up to 12 vol% fiber, initial fiber heat treatments near 1500 °C give tensile modulus and strength superior even to composites made from fibers graphitized at 2900 °C. However, optimum composite conductivity is obtained with a somewhat lower heat-treatment temperature, near 1300 °C. Transmission electron microscopy (TEM) along with x-ray diffraction (XRD) explains these results, showing that heat treating the fibers alters the exterior planes from continuous, coaxial, and poorly crystallized to discontinuous nested conical crystallites inclined at about 25° to the fiber axis.

Keywords

CompositeElectrical propertiesNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 10 , October 2006 , pp. 2646 - 2652
Copyright
Copyright © Materials Research Society 2006

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References

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