Frequency-dependent electrical transport in carbon nanotubes

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Abstract
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.