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Phys. Rev. B 64, 201402(R) (2001) [4 pages]

Frequency-dependent electrical transport in carbon nanotubes

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Y.-P. Zhao1, B. Q. Wei2, P. M. Ajayan2, G. Ramanath2, T.-M. Lu1, and G.-C. Wang1
1Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180-3590
2Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3590

A. Rubio3,4 and S. Roche5
3Departamento de Física Teórica, Universidad de Valladolid, 47011 Valladolid, Spain
4Donostia International Physics Center (DIPC), 20018 Donostia, Basque Country, Spain
5DRFMC/SPSMS-Commissariat à l’Energie Atomique, 38042 Grenoble, France

Received 18 June 2001; published 22 October 2001

Carbon nanotubes exhibit exceptional dc electrical transport but relatively little is known about their ac behavior. We discover, in the ac impedance spectra of nanotubes, an intrinsic resonance at a fixed ultrasonic frequency of 37.6 kHz. In the 100 Hz to 8 MHz frequency range the overall impedance shows a negative capacitance associated with the dynamical response of the metal-nanotube contact. These effects could be used to compensate capacitance in electronic circuits or to fabricate nanotube-based transducers.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.64.201402
DOI:
10.1103/PhysRevB.64.201402
PACS:
73.63.Fg, 61.46.+w, 85.35.Kt
 
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