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The optimal structure-conductivity relation in epoxy-phthalocyanine nanocomposites

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 optima...

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Main Authors: Huijbregts, Laurentia Johanna (Author) , Brom, Hans Bernard (Author) , Zijp, Josephina Cornelia Maria (Author) , Kemerink, Martijn (Author) , Chen, Z. (Author) , de Goeje, M. P. (Author) , Yuan, M. (Author) , Michels, Matthias A. J. (Author)
Format: Article (Journal)
Language:English
Published: October 28, 2006
In: The journal of physical chemistry. B, Biophysics, biomaterials, liquids, and soft matter
Year: 2006, Volume: 110, Issue: 46, Pages: 23115-23122
ISSN:1520-5207
DOI:10.1021/jp063567w
Online Access:Verlag, Volltext: https://doi.org/10.1021/jp063567w
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Author Notes:L.J. Huijbregts, H.B. Brom, J.C.M. Brokken-Zijp, M. Kemerink, Z. Chen, M.P. de Goeje, M. Yuan, and M.A.J. Michels
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Summary: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.
Item Description:Gesehen am 16.12.2019
Physical Description:Online Resource
ISSN:1520-5207
DOI:10.1021/jp063567w

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