title: Effect of the carbon nanotube surface characteristics on the conductivity and dielectric constant of carbon nanotube/poly(vinylidene fluoride) composites.
abstract: Commercial multi-walled carbon nanotubes (CNT) were functionalized by oxidation with HNO3, to introduce oxygen-containing surface groups, and by thermal treatments at different temperatures for their selective removal. The obtained samples were characterized by adsorption of N2 at -196°C, temperature-programmed desorption and determination of pH at the point of zero charge. CNT/poly(vinylidene fluoride) composites were prepared using the above CNT samples, with different filler fractions up to 1 wt%. It was found that oxidation reduced composite conductivity for a given concentration, shifted the percolation threshold to higher concentrations, and had no significant effect in the dielectric response.
authors.affiliation: Universidade do Porto, Faculdade de Engenharia, Laboratório de Catálise e Materiais (LCM), LSRE/LCM - Laboratório Associado, Rua Dr, Roberto Frias, s/n, 4200-465 Porto, Portugal. sonia.carabineiro@fe.up.pt.
authors.forename: Sónia Ac
authors.initials: SA
authors.lastname: Carabineiro
authors.forename: Manuel Fr
authors.initials: MF
authors.lastname: Pereira
authors.forename: João N
authors.initials: JN
authors.lastname: Pereira
authors.forename: Cristina
authors.initials: C
authors.lastname: Caparros
authors.forename: Vitor
authors.initials: V
authors.lastname: Sencadas
authors.forename: Senentxu
authors.initials: S
authors.lastname: Lanceros-Mendez