Temperature dependence of the electrical conductivity of vapor grown carbon nanofiber/epoxy composites with different filler dispersion levels

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Cardoso, P (Autor) Outra; Silva, J (Autor) Outra; Agostinho Moreira, JA (Autor) FCUP; Klosterman, D (Autor) Outra; van Hattum, FWJ (Autor) Outra; Simoes, R (Autor) Outra; Lanceros Mendez, S (Autor) Outra

Revista

Título: Physics Letters A

Vol. 376

Páginas: 3290-3294

ISSN: 0375-9601

Editora: Elsevier

Indexação

ISI Web of Knowledge - 5 Citações

Scopus - 8 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-002-4M3

DOI: 10.1016/j.physleta.2012.09.045

Abstract (EN): The influence of the dispersion of vapor grown carbon nanofibers (VGCNF) on the electrical properties of VGCNF/epoxy composites has been studied. A homogeneous dispersion of the VGCNF does not imply better electrical properties. The presence of well distributed clusters appears to be a key factor for increasing composite conductivity. It is also shown that the main conduction mechanism has an ionic nature for concentrations below the percolation threshold, while above the percolation threshold it is dominated by hopping between the fillers. Finally, using the granular system theory it is possible to explain the origin of conduction at low temperatures.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5