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TitleThe effect of nanotube surface oxidation in the electrical response of MWCNT/PVDF nanocomposites
Author(s)Lanceros-Méndez, S.
Carabineiro, S. A. C.
Pereira, M. F. R.
Caparrós Vásquez, Cristina Maria
Pereira, J. Nunes
Sencadas, Vítor João Gomes Silva
Silva, J.
KeywordsCarbon nanotubes
Surface functionalization
PVDF composites
Electrical properties
Issue date2012
JournalJournal of Materials Science
Abstract(s)Carbon nanotubes / poly(vinylidene fluoride) composites were prepared using CNT with different oxidation and thermal treatments. The oxidation procedure leads to CNT with the most acidic characteristics that lower the degree of crystallinity of the polymer and contribute to a large increase of the dielectric constant. The surface treatments, in general, increase percolation threshold and decrease conductivity, but, on the other hand, are able to promote the nucleation of the electroactive phase of the polymer, which is suitable for the use of PVDF in sensors, actuators and other smart materials applications. Finally, the surface treatments do not seem to affect CNT interaction among them, reaching similar degrees of dispersion in all cases, as shown by the SEM results. The maximum value of the dielectric constant is ~630. It is demonstrated that the composite conductivity can be attributed to a hopping mechanism that is strongly affected by the surface treatment of the CNT.
Publisher version
AccessOpen access
Appears in Collections:CDF - FCD - Artigos/Papers (with refereeing)

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