Journal
SYNTHETIC METALS
Volume 155, Issue 1, Pages 63-67Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2005.05.015
Keywords
poly(paraphenylene vinylene); single-walled carbon nanotubes; composites; optical absorption; Raman spectroscopy; X-ray diffraction; electrical conductivity
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We present a study of the evolution of the structural and electrical properties of poly(paraphenylene vinylene) (PPV) and single-walled carbon nanotubes (SWNT) composites as a function of the concentration of carbon nanotubes. We used essentially scanning electron microscopy (SEM), resonant Raman scattering and X-ray diffraction measurements to investigate the spectroscopic characteristics of the composites. When the SWNT concentration increases, the optical properties exhibit modifications which are discussed in relation with the shortening of conjugated segments lengths and the increase of disorder in PPV. Electrical conductivity measurements show that conductivity of the resulting films increases by eight orders of magnitude as the carbon nanotubes mass fraction increases from 0% to 64%. This result can be explained by using a simple percolation path theory, resulting in an estimated percolation threshold around 2%. (C) 2005 Elsevier B.V. All rights reserved.
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