Resonant modelling of two types of tunable carbon nanotube electromechanical oscillators

Resonant modelling of two types of tunable carbon nanotube electromechanical oscillators
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两种可调谐碳纳米管机电振荡器的谐振建模

DOI:
10.1049/mnl.2010.0072
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发表时间:
2010-12
影响因子:
1.3
通讯作者:
Peng, B.
Peng, B.
中科院分区:
材料科学4区
文献类型:
--
作者:
Ding, L.;Guo, Z.;Peng, B.

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纳米机电系统振荡器已被提出用于各种应用,如射频信号处理和超灵敏传感。碳纳米管(CNT)振荡器的研究表明,该振荡器的谐振频率可调,运动可自检测。采用降阶模型,采用基于连续介质力学的多物理有限元方法,研究了悬臂式和固定式两种碳纳米管振荡器的共振行为。研究发现,当直流偏压改变时,这两类器件的谐振响应不同:固定碳纳米管的谐振频率随着直流偏置的增加而增加,而悬臂梁碳纳米管的谐振频率随着直流偏置的增加而减小。模拟还表明,固定固定的碳纳米管振荡器比悬臂式碳纳米管振荡器具有更好的调谐能力。因此,通常应在振荡器设计中使用固定固定的碳纳米管,除非需要悬臂式器件的独特谐振特性。
Nanoelectromechanical system oscillators have been proposed for a variety of applications, such as radio-frequency signal processing and ultrasensitive sensing. Carbon nanotube (CNT) oscillators demonstrated that the resonance frequency can be widely tuned and the motions can be self-detected. The resonant behaviours of two types of CNT oscillators with cantilevered and fixed–fixed CNT resonators are investigated by continuum mechanics-based multiphysics finite-element method simulations using a reduced order model. It is found that these two types of devices have different resonant responses when the DC bias changes: the resonant frequency of fixed–fixed CNTs increases as the DC bias increases, whereas the resonant frequency of cantilevered CNT devices decreases as the DC bias increases. The simulations also show that the fixed–fixed CNT oscillators have better tuning capabilities than the cantilevered CNT devices. Therefore in general fixed–fixed CNTs should be used in the oscillator designs, unless the unique resonant behaviour of the cantilevered devices is desired.
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