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In Situ Electron Microscopy Electromechanical Characterization of a Bistable NEMS Device
Author(s) -
Ke Changhong,
Espinosa Horacio D.
Publication year - 2006
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200600271
Subject(s) - nanoelectromechanical systems , materials science , bistability , carbon nanotube , nanotechnology , scanning electron microscope , cantilever , electrode , optoelectronics , characterization (materials science) , composite material , chemistry , nanoparticle , nanomedicine
Abstract 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.