Frequency-dependent electrical transport in carbon nanotubes

Physical Review B 64, 201402 - 4 (2001)

Frequency-dependent electrical transport in carbon nanotubes

Y.-P. Zhao, B.Q. Wei, P.M. Ajayan, G. Ramanath, T.-M. Lu, G.-C. Wang, A. Rubio, S. Roche

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.

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http://dx.doi.org/10.1103/PhysRevB.64.201402

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