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

• Type: Article in International Scientific Journal
• Date: 2012

Authors

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

Journal

Title: Physics Letters A

Vol. 376

Pages: 3290-3294

ISSN: 0375-9601

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 5 Citations

Scopus - 8 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5