High-Temperature Resistivity of Dense Mats of Single-Walled Carbon Nanotube Bundles
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–3 as obtained by pressing a weighted amount of SWCNTs at 0.6 GPa. Large hysteresis of resistivity has bee...
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Published in | Journal of physical chemistry. C Vol. 115; no. 22; pp. 11023 - 11029 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
09.06.2011
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Subjects | |
Online Access | Get full text |
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Summary: | 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–3 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. |
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ISSN: | 1932-7447 1932-7455 |
DOI: | 10.1021/jp203149v |