Conduction mechanisms in P(VDF-TrFE)/gold nanowire composites: tunnelling and thermally-activated hopping process near the percolation threshold. (19th August 2016)

• Record Type: Journal Article
• Authors: Ramachandran, Laavanya; Lonjon, Antoine; Demont, Philippe; Dantras, Eric; Lacabanne, Colette
• Is Part Of: Materials research express. Volume 3:Number 8(2016)
• Publication Date: 2016-08-19
• Subjects: gold nanowires -- conducting polymer composite -- conduction mechanism; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/3/8/085027
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: High-aspect ratio gold nanowires were dispersed in a P(VDF-TrFE) matrix to form conducting polymer composites. The composites were found to follow a percolation law, with a low percolation threshold of 2.2%vol and attaining a conductivity value of 100 S m −1 . The temperature and frequency dependence of the composites were studied using broadband dielectric spectroscopy. Tunnelling was found to be the main charge transport mechanism at temperatures below −100 °C and a thermally-activated hopping mechanism was determined to be responsible for conduction at temperatures above −100 °C. The correlated barrier hopping model was found to be the best fit to explain the conduction mechanisms in the composites.