Abstract
We find that the electrical and thermal connectivity in multiwalled carbon nanotubebuckypaper can be tuned using a spark plasma sintering (SPS) technique. Elevated SPStemperatures promote the formation of inter-tube connections and consequentlyimpact the electrical resistivity, thermoelectric power and thermal conductivityof the buckypaper. In particular, the electrical resistivity as a function of SPStemperature exhibits a percolation-type behavior while the low temperature latticethermal conductivity shows a crossover behavior in the sample dimensionality. Theresults are discussed in terms of the quasi-one-dimensional metallic nature ofmultiwalled carbon nanotubes, the packing density and the electron–phonon coupling.
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