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Science 27 April 2001:
Vol. 292. no. 5517, pp. 706 - 709
DOI: 10.1126/science.1058782
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Reports
Engineering Carbon Nanotubes and Nanotube Circuits Using Electrical Breakdown
Philip G. Collins,
Michael S. Arnold,
Phaedon Avouris*
Carbon nanotubes display either metallic or semiconducting
properties. Both large, multiwalled nanotubes (MWNTs), with many concentric carbon shells, and bundles or "ropes" of aligned
single-walled nanotubes (SWNTs), are complex composite conductors that
incorporate many weakly coupled nanotubes that each have a different
electronic structure. Here we demonstrate a simple and reliable method
for selectively removing single carbon shells from MWNTs and SWNT ropes
to tailor the properties of these composite nanotubes. We can remove
shells of MWNTs stepwise and individually characterize the different
shells. By choosing among the shells, we can convert a MWNT into either
a metallic or a semiconducting conductor, as well as directly address
the issue of multiple-shell transport. With SWNT ropes, similar
selectivity allows us to generate entire arrays of nanoscale
field-effect transistors based solely on the fraction of semiconducting
SWNTs.
IBM T. J. Watson Research Center, Yorktown Heights, NY 10598, USA.
*
To whom correspondence should be addressed. E-mail:
avouris{at}us.ibm.com
Read the Full Text
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