| Autor: |
Bozhko, A.D., Sklovsky, D.E., Nalimova, V.A., Rinzler, A.G., Smalley, R.E., Fischer, J.E. |
| Předmět: |
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| Zdroj: |
Applied Physics A: Materials Science & Processing; 1998, Vol. 67 Issue 1, p75, 3p |
| Abstrakt: |
Abstract. The electrical resistance of single-wall carbon nanotubes (SWNT) produced by condensation of a laservaporized graphite/Ni/Co mixture at 1200 Celsius was studied under quasihydrostatic pressures up to 90 kbar. The resistance exhibits a positive temperature coefficient, characteristic of a metal, up to 10 kbar, whereas the absolute value decreases abruptly by a factor Is approximately equal to 10. From 10-30 kbar R increases with pressure and the TCR becomes negative. At still higher pressure, up to 90kbar, R decreases gradually with pressure, similar to the case of graphite. Raman scattering and electron microscopy performed after 25-kbar pressurizations indicate that the SWNT and its lattice are preserved. We propose that the sequential behavior of R(P) reveals in turn the processes of compaction, defect formation by kinking, and finally the van der Waals compression of the inter-tube spacing in the triangular lattice. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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