Carbon
Nanotube Radio

Radio transmissions tuned to the nanotube's resonance frequency force the charged
nanotube to vibrate. Field emission of electrons from the tip of thenanotube is used to detect the vibrations and also amplify and
demodulate the signal. A current measuring device, such as a sensitive speaker, monitors the output of the radio.
K. Jensen, J. Weldon, H. Garcia, and A. Zettl.
"Nanotube Radio," Nano Letters 7 (11), 3508-3511 (2007)