The optimal structure-conductivity relation in epoxy-phthalocyanine nanocomposites

L.J. Huijbregts, H.B. Brom, J.C.M. Brokken-Zijp, M. Kemerink, Z. Chen, M.P. Goeje, de, M. Yuan, M.A.J. Michels

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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-cond. relation in this composite and the deviation from its optimal realization by combining two techniques. The real parts of the elec. cond. of a Phthalcon-11/epoxy coating and of Phthalcon-11 powder were measured by dielec. spectroscopy as a function of frequency and temp. Conducting at. force microscopy (C-AFM) was applied to quantify the cond. 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 cond. that is much lower than that of the filler. Since the structure-cond. relation for the found network is almost optimal, a drastic increase in the cond. of the coating cannot be achieved by changing the particle network, but only by using a filler with a higher cond. level.
Original languageEnglish
Pages (from-to)23115-23122
JournalJournal of Physical Chemistry B
Issue number46
Publication statusPublished - 2006

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