Enhanced sensitivity and tunability of thermomechanical resonance near the buckling bifurcation

IF 4.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Hanqing Liu, Gabriele Baglioni, Carla Boix-Constant, Herre S J van der Zant, Peter G Steeneken, Gerard J Verbiest
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引用次数: 0

Abstract

The high susceptibility of ultrathin two-dimensional (2D) material resonators to force and temperature makes them ideal systems for sensing applications and exploring thermomechanical coupling. Although the dynamics of these systems at high stress has been thoroughly investigated, their behavior near the buckling transition has received less attention. Here, we demonstrate that the force sensitivity and frequency tunability of 2D material resonators are significantly enhanced near the buckling bifurcation. This bifurcation is triggered by compressive displacement that we induce via thermal expansion of the devices, while measuring their dynamics via an optomechanical technique. We understand the frequency tuning of the devices through a mechanical buckling model, which allows to extract the central deflection and boundary compressive displacement of the membrane. Surprisingly, we obtain a remarkable enhancement of up to 14× the vibration amplitude attributed to a very low stiffness of the membrane at the buckling transition, as well as a high frequency tunability by temperature of more than 4.02 % K−1. The presented results provide insights into the effects of buckling on the dynamics of free-standing 2D materials and thereby open up opportunities for the realization of 2D resonant sensors with buckling-enhanced sensitivity.
增强屈曲分叉附近热机械共振的灵敏度和可调性
超薄二维(2D)材料谐振器对力和温度的高敏感性使其成为传感应用和探索热机械耦合的理想系统。虽然这些系统在高应力下的动力学已得到深入研究,但它们在屈曲转换附近的行为却较少受到关注。在这里,我们证明了二维材料谐振器的力灵敏度和频率可调性在屈曲分叉附近显著增强。这种分叉是由压缩位移触发的,我们通过器件的热膨胀诱导压缩位移,同时通过光学机械技术测量其动态。我们通过一个机械屈曲模型来了解器件的频率调整,从而提取膜的中心挠度和边界压缩位移。令人惊讶的是,我们获得了高达 14 倍振动幅度的显著增强,这归功于膜在屈曲转换时的极低刚度,以及超过 4.02% K-1 的高频率温度可调性。本文介绍的结果让人们深入了解了屈曲对独立二维材料动力学的影响,从而为实现具有屈曲增强灵敏度的二维谐振传感器提供了机会。
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来源期刊
2D Materials
2D Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
10.70
自引率
5.50%
发文量
138
审稿时长
1.5 months
期刊介绍: 2D Materials is a multidisciplinary, electronic-only journal devoted to publishing fundamental and applied research of the highest quality and impact covering all aspects of graphene and related two-dimensional materials.
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