Abstract
Capacitive nano-switches have been of great interest as replacements for conventional semiconductor switches. Accurate determination of the pull-in voltage is critical in the design process. In the present investigation, pull-in instability of nano-switches made of two parallel plates subjected to electrostatic force is studied. For this purpose, two parallel rectangular nanoplates with opposite charges are modeled based on molecular dynamics (MD) technique. Different initial gaps between nanoplates and its effect on pull-in phenomena are studied in addition to taking different values of geometrical and physical parameters into account to evaluate pull-in voltages. Here molecular dynamic simulations as an atomic interaction approach are employed for modeling of nano-switches in order to study pull-in instability considering atomic interaction and surface tension. Boundary conditions and also the van der Waals force are considered as important parameters to investigate their effects on pull-in voltage values.
Highlights
The potential difference across the conductors develops an electric field across the dielectric, causing positive plate to come in contact with the ground plane
Accurate determination of the pull-in voltage is critical in the design process of capacitive switches and in virtue of the electromechanical coupling effect and the nonlinearity of electrostatic force [1] [2]
The geometrical parameters of nanoswitches are considered in molecular dynamics (MD) simulations, i.e. h= 2.17 nm, a= b= 15.07 nm as are seen below
Summary
The potential difference across the conductors develops an electric field across the dielectric, causing positive plate to come in contact with the ground plane. Molecular dynamics simulation of pull-in phenomena is derived in carbon nanotubes to study Stone-Wales defects, different geometries and boundary conditions on the pull-in charges [23] [24]. Different methods such as molecular mechanics and atomistic modeling are employed in order to investigate the mechanical behaviors of nanostructures. Mousavi et al [28] studied the small scale effect on the pull-in instability of nano-switches subjected to electrostatic and intermolecular forces. The pull-in instability of electrostatically actuated nano-switches is studied with considering the small scale effect conducting molecular dynamic simulation. In addition to investigate the effects of van der Waals force in the small-scale, the simulation is solved by both considering and neglecting van der Waals force, and the results are compared
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