High efficiency carbon nanotube thread antennas

Carbon Nanotube High Frequency Devices

Achieving high-current carbon nanotube emitters.

When a carbon nanotube emitter is operated at high currents (typically above 1 microA per emitter), a small voltage drop ( approximately few volts) along its length or at its contact generates a reverse/canceling electric field that causes a saturation-like deviation from the classical Fowler-Nordheim behavior with respect to the applied electric field. We present a correction to the Fowler-Nor...

High Strength Metal-Carbon Nanotube Composites

Uniform dispersion of pre-synthesized nanotubes in metal matrices is difficult to achieve, and there is substantial damage to the nanotubes during subsequent composite fabrication. The demonstration of an in-situ process involving chemical vapor deposition of single-wall and multi-wall carbon nanotubes into iron matrices without the concomitant formation of iron carbides is reported here. It wa...

High performance electrolyte-gated carbon nanotube transistors

High performance electrolyte-gated carbon nanotube transistors Sami Rosenblatt, Yuval Yaish, Jiwoong Park, Jeff Gore, Vera Sazonova, and Paul L. McEuen Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853 Department of Physics, University of California, Berkeley, CA 94720 Abstract We have fabricated high performance field-effect transistors made from semiconducting...

High density, vertically-aligned carbon nanotube membranes.

A method is presented to prepare high-density, vertically aligned carbon nanotube (VA-CNT) membranes. The CNT arrays were prepared by chemical vapor deposition (CVD), and the arrays were collapsed into dense membranes by capillary-forces due to solvent evaporation. The average space between the CNTs after shrinkage was approximately 3 nm, which is comparable to the pore size of the CNTs. Thus, ...