Transport properties of hot-pressed bulk carbon nanotubes compacted by spark plasma sintering

Jianlin Li, Lianjun Wang, Tin He, Wan Jiang

Research output: Contribution to journalArticle

Abstract

Electrical and thermal transport properties of the carbon nanotube bulk material compacted by spark plasma sintering have been investigated. The electrical conductivity of the as-prepared sample shows a lnT dependence from 4 to 50 K, after which the conductivity begins to increase approximately linearly with temperature. A magnetic field applied perpendicularly to the sample increases the electrical conductivity in the range of 0-8T at all testing temperatures, indicating that the sample possesses the two-dimensional weak localization at lower temperatures (?50 K), while behaviors like a semimetal at higher temperatures (?50 K). This material acts like a uniform compact consisting of randomly distributed two dimensional graphene layers. For the same material, the thermal conductivity is found to decrease almost linearly with decreasing temperature, similar to that of a single multi-walled carbon nanotube. Magnetic fields applied perpendicularly to the sample cause the thermal conductivity to decrease significantly, but the influence of the magnetic fields becomes weak when temperature increases.
Original languageEnglish
Pages (from-to)1135-1140
Number of pages6
JournalCarbon
Volume47
Issue number4
DOIs
Publication statusPublished - Apr 2009

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