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arXiv · 1010.6099

Capacitive Spring Softening in Single-Walled Carbon Nanotube Nanoelectromechanical Resonators

Chung Chiang Wu·Zhaohui Zhong
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Abstract

We report the capacitive spring softening effect observed in single-walled carbon nanotube (SWNT) nanoelectromechanical (NEM) resonators. The nanotube resonators adopt dual-gate configuration with both bottom-gate and side-gate capable of tuning the resonance frequency through capacitive coupling. Interestingly, downward resonance frequency shifting is observed with increasing side-gate voltage, which can be attributed to the capacitive softening of spring constant. Furthermore, in-plane vibrational modes exhibit much stronger spring softening effect than out-of-plan modes. Our dual-gate design should enable the differentiation between these two types of vibrational modes, and open up new possibility for nonlinear operation of nanotube resonators.

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Chung Chiang Wu, Zhaohui Zhong. 2010-10-28. Capacitive Spring Softening in Single-Walled Carbon Nanotube Nanoelectromechanical Resonators. https://doi.org/10.1021/nl1039549

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