Tunneling transport in conductor-insulator composites and the role of microstructure

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• Dr Claudio Grimaldi (EPFL, Switzerland)
• Friday 16 September 2011, 12:00-13:00
• Unilever Lecture Theatre, Department of Chemistry.

If you have a question about this talk, please contact Dr Mark Miller.

In several classes of conductive composites the electron transfer between the conducting particles is established by the quantum tunneling mechanism. Although the microstrucures of, for example, nanofiber or nanotube composites differ markedly from those of granular metals or segregated composites, their common microscopic conduction mechanism calls for a unified description of their transport properties. In this talk, I introduce and discuss a global tunneling network approach to conductor-insulator composites, where each conducting particle is connected to all others via tunneling processes. I will show how the microstrucure properties of composites govern the overall conductivity behavior and I will point out analogies and differences with respect to the usual continuum and/or lattice percolation approaches.

This talk is part of the Extra Theoretical Chemistry Seminars series.

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