Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Measurement of Complex Impedance of Individual Metallic Carbon Nanotubes



Jan Obrzut, Kalman D. Migler, L F. Dong, J Jiao


We describe impedance measurements of individual single wall carbon nanotubes (CNTs) in the frequency range of 40 Hz to 100 MHz. The extracted CNT capacitance of 4 10-14 F/mm, is independent of the total resistance, however the CCNT value is larger than theoretically predicted quantum capacitance of a perfect tube. We observe a sharp conductor-insulator transition at a crossover frequency above which the circuit response becomes capacitive. Our results agree qualitatively with the theoretical impedance characteristic of a perfect CNT, and furthermore, they imply that the crossover frequency due to quantum capacitance would fall in the range of about 100 GHz.
IEEE Transactions on Instrumentation and Measurement


Obrzut, J. , Migler, K. , Dong, L. and Jiao, J. (2007), Measurement of Complex Impedance of Individual Metallic Carbon Nanotubes, IEEE Transactions on Instrumentation and Measurement, [online], (Accessed April 14, 2024)
Created May 3, 2007, Updated February 19, 2017