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Scanning tunneling spectroscopy of carbon nanotubes

Published online by Cambridge University Press:  03 March 2011

Charles H. Olk  and
Joseph P. Heremans
Charles H. Olk
Affiliation:
General Motors Research, Warren, Michigan 48090
Joseph P. Heremans
Affiliation:
General Motors Research, Warren, Michigan 48090
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Abstract

Calculations predict that carbon nanotubes may exist as either semimetals or semiconductors, depending on diameter and degree of helicity. This communication presents experimental evidence supporting the calculations. Scanning tunneling microscopy and spectroscopy (STM-S) data taken in air on nanotubes with outer diameters from 17 to 90 Å show evidence of one-dimensional behavior; the current-voltage (I-V) characteristics are consistent with a density of states containing Van Hove type singularities for which the energies vary linearly with inverse nanotube diameter.

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Type
Rapid Communications
Information
Journal of Materials Research , Volume 9 , Issue 2 , February 1994 , pp. 259 - 262
Copyright
Copyright © Materials Research Society 1994

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