High-mobility semiconducting carbon nanotubes

Apr 29, 2004
Nanotube

T Durkop, B M Kim and M S Fuhrer reviewed experiments to determine the resistivity and charge-carrier mobility in semiconducting carbon nanotubes in Journal of Physics: Condens. Matter (vol. 16, 2004, R553-R580)
Electron transport experiments on long chemical-vapour-deposition-grown semiconducting carbon nanotubes are interpreted in terms of diffusive transport in a field-effect transistor. This allows for extraction of the field-effect and saturation mobilities for hole carriers, as well as an estimate of the intrinsic hole mobility of the nanotubes. The intrinsic mobility can exceed 100 000 cm2 V-1 s-1 at room temperature, which is greater than any other known semiconductor.

Scanned-probe experiments show a low degree of disorder in chemical-vapour-deposition-grown semiconducting carbon nanotubes compared with laser-ablation produced nanotubes, and show conductivity and mean-free-path consistent with the high mobility values seen in transport experiments.

The results indicate that semiconducting nanotubes should be an excellent material for a number of semiconductor applications, especially in high-speed transistors where mobility is crucial.

The application of high-mobility semiconducting nanotubes to charge detection and
memory is also reviewed; it is shown that single electronic charges may be
detected with a semiconducting nanotube field-effect transistor at operating
temperatures up to 200 K.

The results suggest that semiconducting nanotubes may find applications as exquisite sensors of e.g. chemical or biochemical species, in which a chemical signal is translated into charge. Single molecule detection appears feasible with such a device.

Explore further: How we can substitute critical raw materials in catalysis, electronics and photonics

add to favorites email to friend print save as pdf

Related Stories

Recommended for you

New nanodevice defeats drug resistance

27 minutes ago

Chemotherapy often shrinks tumors at first, but as cancer cells become resistant to drug treatment, tumors can grow back. A new nanodevice developed by MIT researchers can help overcome that by first blocking ...

Glass coating improves battery performance

49 minutes ago

Lithium-sulfur batteries have been a hot topic in battery research because of their ability to produce up to 10 times more energy than conventional batteries, which means they hold great promise for applications ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.