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Modeling electrostatically induced collapse transitions in carbon nanotubes.

Oleg E Shklyaev¹, Eric Mockensturm, Vincent H Crespi

¹Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania, 16802-6300, USA.

Physical Review Letters

|May 17, 2011

Summary

Single-walled carbon nanotubes act as tunable capacitors. Their sensitivity to external factors like temperature and voltage allows for highly sensitive nano-sensors and actuators.

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Area of Science:

Nanotechnology
Materials Science
Physics

Background:

Single-walled carbon nanotubes (SWCNTs) exhibit unique mechanical properties.
Bistable mechanical behavior in SWCNTs can be exploited for device applications.

Purpose of the Study:

To investigate the potential of mechanically bistable SWCNTs as variable-shaped capacitors.
To explore the use of SWCNTs as highly sensitive sensors and actuators.

Main Methods:

Utilizing molecular dynamics simulations to model SWCNT behavior.
Analyzing the influence of voltage tuning on SWCNT states.

Main Results:

SWCNTs function as variable-shaped capacitors.
Tuning voltage to degenerate collapsed and inflated states leads to divergent susceptibility to external stimuli.

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A single trapped atom can induce significant shifts in the SWCNT's state boundary.

Conclusions:

Mechanically bistable SWCNTs offer a platform for sensitive nano-sensors and actuators.
Electrically tuned crossovers in SWCNT configurations enable novel nanoelectromechanical devices.