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Science 3 October 1997:
Vol. 278. no. 5335, pp. 100 - 102
DOI: 10.1126/science.278.5335.100
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Reports

Nanotube Nanodevice

Philip G. Collins, A. Zettl, * Hiroshi Bando, Andreas Thess, R. E. Smalley

A scanning tunneling microscope (STM) was used to explore the local electrical characteristics of single-wall carbon nanotubes. As the STM tip was moved along the length of the nanotubes, well-defined positions were found where the transport current changes abruptly from a graphitic-like response to one that is highly nonlinear and asymmetrical, including near-perfect rectification. The observations are consistent with the existence of localized, on-tube nanodevices of a type proposed theoretically.

P. G. Collins and A. Zettl, Department of Physics, University of California at Berkeley, and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
H. Bando, Physical Science Division, Electrotechnical Laboratory, Tsukuba, Ibaraki 305, Japan.
A. Thess and R. E. Smalley, Center for Nanoscale Science and Technology, and Departments of Chemistry and Physics, Rice University, Houston, TX 77005, USA.
*   To whom correspondence should be addressed. E-mail: azettl{at}physics.berkeley.edu

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