Journal
MATERIALS LETTERS
Volume 62, Issue 26, Pages 4229-4231Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2008.06.047
Keywords
carbon nanotube; composite materials; electrical properties; percolation threshold
Funding
- CNPC Innovation Fund [06E1024]
- Key Project of Chinese Ministry of Education [106036]
- Shandong Natural Science Foundation [Y2005A10]
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The chemically purified multiwalled carbon nanotube/poly(vinylidene fluoride) (MWCNT/PVDF) composites were fabricated. Raman spectroscopy and transmission electron microscopy micrographs indicated that the catalysts metal particles and amorphous carbon had been removed from the purified MWCNTs. The percolation threshold of the composites is relatively large. about 3.8 vol.%. The most important result is that the dielectric constant of the composires is enhanced remarkably, and the dielectric constant of 3600 is obtained in the composite with 8 vol.% purified MWCNT at 1 kHz. The large dielectric constant can be attributed to the preparation procedure and the interface effect between the MWCNTs and the polymer. (c) 2008 Elsevier B.V. All rights reserved.
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