Find out about the
Ultracapacitor R&D
report from
Energy Research News


Methanol nixes metallic nanotubes

  February 2/9, 2009
Come up with the right mix of chemicals and you can grow a pure batch of semiconducting carbon nanotubes.

A vapor of ethanol, methanol, argon and hydrogen in a furnace produces single-walled carbon nanotubes. Most methods of growing carbon nanotubes produce a mix of semiconducting and metallic nanotubes. Adding methanol to the process assures that 95 to 98 percent of the nanotubes are semiconducting.

Semiconducting carbon nanotubes grown on a quartz surface are straight and closely packed, which makes them usefull as dense transistor arrays. Metallic nanotubes cause short circuits that limit the number of usable transistors.

The transistor arrays can be used to make sensors, and they could lead to new types of high-speed computer chips.

Research paper:
Selective Growth of Well-Aligned Semiconducting Single-Walled Carbon Nanotubes
Nano Letters, published online January 20, 2009

Researchers' homepage:
Jie Liu Laboratory, Duke University

Related stories and briefs:
Quartz keeps nanotubes in line -- precursor research
Soapy nanotube sorter -- related research
DNA sorts nanotubes -- related research

Back to TRN February 2/9, 2009

Research Watch blog
View from the High Ground Q&A
How It Works

RSS Feeds:
News  | Blog

Ad links: Clear History

Buy an ad link

Home     Archive     Resources    Feeds    Glossary
Search     Research Orgs    Events Dir.      Researchers     Bookshelf
   Contribute      T-shirts etc.     Ad Finder

© Copyright Technology Research News 2000-2010. All rights reserved.