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: | , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
October 28, 2006
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| 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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| 520 | |a 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. | ||
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| 700 | 1 | |a Yuan, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Michels, Matthias A. J. |e VerfasserIn |4 aut | |
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