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The optimal structure-conductivity relation in epoxy-phthalocyanine nanocomposites
Technical University of Eindhoven, Netherlands.
Technical University of Eindhoven, Netherlands.
Technical University of Eindhoven, Netherlands.
Linköping University, Department of Physics, Chemistry and Biology, Chemical and Optical Sensor Systems. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-7104-7127
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2006 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 110, no 46, 23115-23122 p.Article in journal (Refereed) Published
Abstract [en]

Phthalcon-11 (aquocyanophthalocyaninatocobalt (III)) forms semiconducting nanocrystals that can be dispersed in epoxy coatings to obtain a semiconducting material with a low percolation threshold. We investigated the structure-conductivity relation in this composite and the deviation from its optimal realization by combining two techniques. The real parts of the electrical conductivity of a Phthalcon-11/ epoxy coating and of Phthalcon-11 powder were measured by dielectric spectroscopy as a function of frequency and temperature. Conducting atomic force microscopy (C-AFM) was applied to quantify the conductivity through the coating locally along the surface. This combination gives an excellent tool to visualize the particle network. We found that a large fraction of the crystals is organized in conducting channels of fractal building blocks. In this picture, a low percolation threshold automatically leads to a conductivity that is much lower than that of the filler. Since the structure-conductivity relation for the found network is almost optimal, a drastic increase in the conductivity of the coating cannot be achieved by changing the particle network, but only by using a filler with a higher conductivity level.

Place, publisher, year, edition, pages
American Chemical Society , 2006. Vol. 110, no 46, 23115-23122 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:liu:diva-118200DOI: 10.1021/jp063567wISI: 000242045900029PubMedID: 17107152OAI: oai:DiVA.org:liu-118200DiVA: diva2:813495
Available from: 2015-05-22 Created: 2015-05-22 Last updated: 2015-06-01

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Kemerink, Martijn
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Chemical and Optical Sensor SystemsThe Institute of Technology
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