Higherature resistivity of dense mats of single-walled carbon nanotube bundles
Journal of Physical Chemistry C, ISSN: 1932-7455, Vol: 115, Issue: 22, Page: 11023-11029
2011
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Article Description
The resistivity of mats of single-walled carbon nanotube (SWCNT) bundles has been measured in the temperature range 286-1051 K under high vacuum. The apparent density of mats was close to 1 g cm as obtained by pressing a weighted amount of SWCNTs at 0.6 GPa. Large hysteresis of resistivity has been recorded through thermal cycles at different temperature rate changes. At constant temperature, the mats display a perfect ohmic behavior. Notwithstanding the metallic behavior, the Bloch-Grüneisen equation is not fully respected, and it has been modified with the insert of a temperature-dependent term that accounts for changes inside and among the bundles. The coefficient of thermal resistivity has been found strongly dependent on temperature with a maximum at 566 K and crossing zero at 310 K. A simple model to explain the TCR behavior is given which is supported by the micropore size distribution and BJH isotherms. © 2011 American Chemical Society.
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