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Enhancing the mass sensitivity of graphene nanoresonators via nonlinear oscillations: The effective strain mechanism

机译：通过非线性振荡增强石墨烯纳米谐振器的质量敏感性：有效的应变机制

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摘要

We perform classical molecular dynamics simulations to investigate the enhancement of the mass sensitivity and resonant frequency of graphene nanomechanical resonators that is achieved by driving them into the nonlinear oscillation regime. The mass sensitivity as measured by the resonant frequency shift is found to triple if the actuation energy is about 2.5 times the initial kinetic energy of the nanoresonator. The mechanism underlying the enhanced mass sensitivity is found to be the effective strain that is induced in the nanoresonator due to the nonlinear oscillations, where we obtain an analytic relationship between the induced effective strain and the actuation energy that is applied to the graphene nanoresonator. An important implication of this work is that there is no need for experimentalists to apply tensile strain to the resonators before actuation in order to enhance the mass sensitivity. Instead, enhanced mass sensitivity can be obtained by the far simpler technique of actuating nonlinear oscillations of an existing graphene nanoresonator.
机译：我们进行经典的分子动力学模拟，以研究石墨烯纳米机械谐振器的质量敏感性和谐振频率的提高，这是通过将其驱动到非线性振荡状态来实现的。如果激励能量约为纳米谐振器初始动能的2.5倍，则通过谐振频移测量的质量灵敏度将增加三倍。发现质量敏感度提高的根本原因是由于非线性振荡而在纳米谐振器中引起的有效应变，在此我们获得了诱发的有效应变与施加到石墨烯纳米谐振器的驱动能量之间的解析关系。这项工作的重要意义在于，实验人员无需在致动之前向谐振器施加拉伸应变以提高质量灵敏度。取而代之的是，通过激活现有石墨烯纳米谐振器的非线性振荡的简单得多的技术，可以获得更高的质量灵敏度。

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