Abstract
We study the pull-in voltage characteristics ofseveral nanotube electromechanical switches, such as double-wall carbon nanotubes suspended over a graphitic groundelectrode. We propose parametrized continuum models for threecoupled energy domains: the elastostatic energy domain, theelectrostatic energy domain and the van der Waals energy domain.We compare the accuracy of the continuum models with atomistic simulations. Numerical simulations based on continuum modelsclosely match the experimental data reported for carbon-nanotube-based nanotweezers. An analytical expression, based on a lumped model, is derived to compute the pull-in voltage ofcantilever and fixed-fixed switches. We investigate thesignificance of van der Waals interactions in the design ofnanoelectromechanical switches.
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