Journal
SMALL
Volume 2, Issue 12, Pages 1484-1489Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.200600271
Keywords
bistability; carbon nanotubes; memory elements; nanoetectromechanical systems (NEMS); tunneling
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A previously proposed two-terminal carbon-nanotube-based device with closed-loop feedback is demonstrated through in situ scanning electron microscopy (SEM) experiments. The pull-in/pull-out tests were carried out using a multi-walled carbon nanotube (MWCNT) welded to a conductive probe attached to a nanomanipulator. The MWCNTs were cantilevered over a gold electrode and electrostatically actuated. The measured current-voltage curves exhibited the theoretically predicted hysteretic loop between the pull-in and pull-out processes. Both experiments and theoretical modeling demonstrated the bistability of the device confirming its utility in applications such as memory elements, NEMS switches, and logic devices. Failure mechanisms observed during the pull-in/pull-out event are also reported and discussed.
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