Scanning tunneling microscopy and
spectroscopy studies of single wall carbon
nanotubes
T.W. Odom, J-L. Huang, P. Kim, M. Ouyang, C.M. Lieber
(Harvard University)
Scanning
tunneling microscopy and spectroscopy have been used to characterize the
atomic structure and tunneling density of states of individual single-wall
carbon nanotubes (SWNTs) and ropes containing many SWNTs. Analysis of
atomically-resolved SWNT images shows that the nanotubes consist of
a wide range of diameters and helicities with no one structure clearly
dominant. Tunneling spectroscopy measurements made simultaneously on
atomically-resolved SWNTs exhibit semiconducting and metallic behavior
that depend predictably on helicity and diameter. In addition, the band
gaps of the semiconducting tubes were also found to depend inversely on
diameter. These results are compared to theoretical predictions, and the
implications of these studies as well as important future directions
are discussed.
Order No.:
JA809-004 © 1998 MRS
Go to September 1998 Table of Contents
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