Nanoscale Electrical and Mechanical Characteristics of Conductive Polyaniline Network in Polymer Composite Films
2014 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 6, no 21, 19168-19175 p.Article in journal (Refereed) Published
The presence and characteristics of a connected network of polyaniline (PANI) within a composite coating based on polyester acrylate (PEA) has been investigated. The bulk electrical conductivity of the composite was measured by impedance spectroscopy. It was found that the composite films containing PANI have an electrical conductivity level in the range of semiconductors (order of 10–3 S cm–1), which suggests the presence of a connected network of the conductive phase. The nanoscopic distribution of such a network within the cured film was characterized by PeakForce tunneling atomic force microscopy (AFM). This method simultaneously provides local information about surface topography and nanomechanical properties, together with electrical conductivity arising from conductive paths connecting the metallic substrate to the surface of the coating. The data demonstrates that a PEA-rich layer exists at the composite–air interface, which hinders the conductive phase to be fully detected at the surface layer. However, by exposing the internal structure of the composites using a microtome, a much higher population of a conductive network of PANI, with higher elastic modulus than the PEA matrix, was observed and characterized. Local current–voltage (I–V) spectroscopy was utilized to investigate the conduction mechanism within the nanocomposite films, and revealed non-Ohmic characteristics of the conductive network.
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2014. Vol. 6, no 21, 19168-19175 p.
conducting polymer, polyaniline, conductive network, PeakForce TUNA AFM
IdentifiersURN: urn:nbn:se:kth:diva-155188DOI: 10.1021/am505161zISI: 000344978200098ScopusID: 2-s2.0-84910129848OAI: oai:DiVA.org:kth-155188DiVA: diva2:760086
FunderSwedish Foundation for Strategic Research Swedish Research Council
QC 20141119. QC 20150112. Updated from e-pub ahead of print to published.2014-11-032014-11-032015-01-12Bibliographically approved