石墨烯谐振梁的分子动力学研究  

Molecular dynamics study of graphene resonant beams

作　　者：邢维巍[1] 马翠萍 樊尚春[1] Xing Weiwei;Ma Cuiping;Fan Shangchun(School of Instrumentation&Optoelectronic Engineering,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191

出　　处：《电子测量技术》2020年第18期151-157,共7页Electronic Measurement Technology

基　　金：国家自然科学基金(61773045);长江学者和创新团队发展计划(IRT_16R02);国家重大仪器专项(2014YQ350461)资助。

摘　　要：石墨烯谐振梁的力学性能和振动特性是石墨烯谐振式传感器的研究重点。基于分子动力学法对石墨烯谐振梁的力学性能及振动特性展开研究。对于谐振梁的力学性能,提出了一种基于势能与应变关系求解谐振梁杨氏模量的方法,验证了此方法具有可行性,并应用此方法发现了存在的缺陷使得石墨烯谐振梁杨氏模量降低。对于谐振梁振动特性的研究,提出了一种基于动势能转换关系求解谐振梁谐振频率的方法,验证了此方法具有可行性,并应用此方法发现了存在的缺陷使得石墨烯谐振梁谐振频率降低、谐振器的灵敏度降低。The mechanical properties and vibration characteristics of graphene resonant beams are the focus of graphene resonant sensors. The mechanical properties and vibration characteristics of graphene resonant beams are studied based on molecular dynamics. For the mechanical properties of the resonant beam, a method for solving the Young′s modulus of the resonant beam based on the relationship between potential energy and strain is proposed. The method is feasible and it is found that the existence of defects causes the Young′s modulus of the graphene resonant beam to decrease. For the study of the vibration characteristics of the resonant beam, a method for solving the resonant frequency of the resonant beam based on the dynamic energy conversion relationship is proposed. The method is feasible and it is found that the existence of the defects causes the resonant frequency of the graphene resonant beam and the sensitivity of the resonator to decrease.

关 键 词：石墨烯谐振梁 分子动力学法 杨氏模量 谐振频率 缺陷 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]