He Ji-Dong, Jiang Jin-Wu
Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, People's Republic of China.
Nanotechnology. 2019 Jun 28;30(26):265701. doi: 10.1088/1361-6528/ab0f86. Epub 2019 Mar 13.
Misfit strain is inevitable in various heterostructures like the graphene/MoS van der Waals heterostructure. Although the misfit strain effect on electronic and other physical properties have been well studied, it is still unclear how the misfit strain will affect the performance of the nanomechanical resonator based on the graphene/MoS heterostructure. By performing molecular dynamics simulations, we disclose a misfit strain-induced decoupling phenomenon between the graphene layer and the MoS layer during the resonant oscillation of the heterostructure. A direct relationship between the misfit strain and the decoupling mechanism is successfully established through the retraction force analysis. We further suggest to use the graphene/MoS/graphene sandwich heterostructure for the nanomechanical resonator application, which is able to prevent the misfit strain-related decoupling phenomenon. These results provide valuable information for the future application of the graphene/MoS heterostructure in the nanomechanical resonator field.
在诸如石墨烯/MoS范德华异质结构等各种异质结构中，失配应变是不可避免的。尽管失配应变对电子和其他物理性质的影响已得到充分研究，但失配应变如何影响基于石墨烯/MoS异质结构的纳米机械谐振器的性能仍不清楚。通过进行分子动力学模拟，我们揭示了在异质结构的共振振荡过程中，失配应变诱导的石墨烯层和MoS层之间的解耦现象。通过回缩力分析成功建立了失配应变与解耦机制之间的直接关系。我们进一步建议将石墨烯/MoS/石墨烯三明治异质结构用于纳米机械谐振器应用，这能够防止与失配应变相关的解耦现象。这些结果为石墨烯/MoS异质结构在纳米机械谐振器领域的未来应用提供了有价值的信息。
