On the electrical conductivity of silver-content-controlled polyaniline-silver composites

0428954 - ÚMCH 2015 RIV GR eng J - Journal Article
Varga, M. - Prokeš, J. - Bober, Patrycja - Stejskal, Jaroslav
On the electrical conductivity of silver-content-controlled polyaniline-silver composites.
Journal of Nanostructured Polymers and Nanocomposites. Roč. 9, č. 3 (2013), s. 76-83. ISSN 1790-4439.
[International Conference on Nanostructured Polymers and Nanocomposites /7./. Prague, 24.04.2012-27.04.2012]
R&D Projects: GA AV ČR IAA400500905
Institutional support: RVO:61389013
Keywords : conducting polymer composites * polyaniline * silver
Subject RIV: CD - Macromolecular Chemistry
http://www.jnpn.org/03,09,03,03.html

Polyaniline–silver composites with variable content of silver (up to 30 vol.%) were produced by the oxidation of aniline with a mixture of two oxidants, silver nitrate and ammonium peroxydisulfate, in 1 M aqueous solution of methanesulfonic or acetic acid. The dependence of electrical conductivity on silver content is discussed in a framework of the percolation phenomenon with threshold between 21–24 vol.% for polyaniline salts and 25–27 vol.% for corresponding bases. Two different regions were found, semiconducting/insulating one for lower contents of silver, and metallic one, typical for silver-rich systems. Several transport mechanisms, such as the variable-range hopping, the charging-energy-limited tunnelling, the fluctuation-induced tunnelling, and Arrhenius activated transport were considered. The influence of doping acid, dynamic vacuum, and ageing on the electrical properties of composites was studied as well.
Permanent Link: http://hdl.handle.net/11104/0237009