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Impedance spectroscopy characterization of relaxation mechanisms in gold-chitosan nanocomposites
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Alexandru Ioan Cuza University, Romania.
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2015 (English)In: Composites Part B: Engineering, ISSN 1359-8368, E-ISSN 1879-1069, Vol. 71, 210-217 p.Article in journal (Refereed) Published
Abstract [en]

Au-Chi nanocomposites with different AuNPs additions were investigated. The dispersion of AuNPs in polymer matrix was observed using s-SNOM analysis. The dielectric properties as a function of temperature show two relaxation processes: (1) a primary alpha-relaxation process, at low temperatures; (2) a second low frequency relaxation at temperatures between 70 degrees C and 150 degrees C identified as the sigma-relaxation often associated with short range ion mobility. In nanocomposite films, the sigma-relaxation process overcomes the alpha-relaxation process so that the glass transition is no longer detected. The dielectric nonlinear properties (tunability) shown an increase of dipolar moment with AuNPs additions and this results are in good correlation with matrix modification in FTIR investigation.

Place, publisher, year, edition, pages
2015. Vol. 71, 210-217 p.
Keyword [en]
Polymer-matrix composites (PMCs), Electrical properties, Physical properties
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-115269DOI: 10.1016/j.compositesb.2014.11.038ISI: 000348889100023OAI: oai:DiVA.org:su-115269DiVA: diva2:799792
Note

AuthorCount:6;

Available from: 2015-03-31 Created: 2015-03-18 Last updated: 2017-12-04Bibliographically approved

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