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Published September 2005 | public
Journal Article

Novel electrical switching behaviour and logic in carbon nanotube Y-junctions


Carbon-nanotube-based electronics offers significant potential as a nanoscale alternative to silicon-based devices for molecular electronics technologies. Here, we show evidence for a dramatic electrical switching behaviour in a Y-junction carbon-nanotube morphology. We observe an abrupt modulation of the current from an on- to an off-state, presumably mediated by defects and the topology of the junction. The mutual interaction of the electron currents in the three branches of the Y-junction is shown to be the basis for a potentially new logic device. This is the first time that such switching and logic functionalities have been experimentally demonstrated in Y-junction nanotubes without the need for an external gate. A class of nanoelectronic architecture and functionality, which extends well beyond conventional field-effect transistor technologies, is now possible.

Additional Information

© 2005 Nature Publishing Group. Received 16 March 2005; Accepted 8 June 2005; Published online 14 August 2005. P.R.B. acknowledges useful discussions with M. Di Ventra and J. Lagerkvist. We also thank graduate students N. Gothard and J. Gaillard for synthesizing the Y-junction nanotubes, and P. Yu who set up the LabView programs for data acquisition. We acknowledge the support of the work by NSF-NIRTs under Grant numbers DMI-0210559, DMI-0303790, DMI-0304019 and University of California Discovery Fund under Grant No. ele02-10133/Jin. The authors declare that they have no competing financial interests.

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October 20, 2023