Zhu Pengcheng, Zhang Hao, Zhang Xingbin, Cao Wei, Wang Quan
Zhenjiang Key Laboratory of Advanced Sensing Materials and Devices, School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China.
School of Mechanical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, People's Republic of China.
Nanotechnology. 2022 Sep 12;33(48). doi: 10.1088/1361-6528/ac8c9b.
The unique mechanical properties of graphene make it an excellent candidate for resonators. We have used molecule dynamic to simulate the resonance process of graphene. The kirigami approach was introduced to improve the mass sensitivity of graphene sheets. Three geometric parameters governing the resonant frequency and mass sensitivity of Kirigami graphene NEMS were defined. The simulation results show that the closer the kirigami defect is to the center of the drum graphene, the higher the mass sensitivity of the graphene. The kirigami graphene shows up to about 2.2 times higher mass sensitivity compared to pristine graphene. Simultaneously, the kirigami graphene has a higher out-of-plane amplitude and easy access to nonlinear vibrations, leading to higher mass sensitivity. Besides, the kirigami structure can restrict the diffusion of gold atoms on graphene under high initial velocity or large tension condition. It is evident that a reasonable defect design can improve the sensitivity and stability of graphene for adsorption mass.
石墨烯独特的力学性能使其成为谐振器的理想候选材料。我们利用分子动力学模拟了石墨烯的共振过程。引入了kirigami方法来提高石墨烯片的质量灵敏度。定义了三个控制kirigami石墨烯纳米机电系统谐振频率和质量灵敏度的几何参数。模拟结果表明，kirigami缺陷离鼓形石墨烯中心越近，石墨烯的质量灵敏度越高。与原始石墨烯相比，kirigami石墨烯的质量灵敏度高出约2.2倍。同时，kirigami石墨烯具有更高的面外振幅，易于产生非线性振动，从而导致更高的质量灵敏度。此外，kirigami结构可以在高初始速度或大张力条件下限制金原子在石墨烯上的扩散。显然，合理的缺陷设计可以提高石墨烯对吸附质量的灵敏度和稳定性。
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