Zienkiewicz Centre for Computational Engineering, Swansea University, Swansea SA1 8EN, United Kingdom.
Nanotechnology. 2020 Apr 3;31(14):145705. doi: 10.1088/1361-6528/ab6231. Epub 2019 Dec 16.
Carbon-based nano hetero-structures are receiving increasing attention due their ability in multi-synchronous modulation of a range of mechanical and other critically desirable properties. In this paper, the vibration characteristics of two different graphene based heterostructures, graphene-hexagonal boron nitride (hBN) and graphene-molybdenum disulfide (MoS), are explored based on atomistic finite element approach. Such vibrational characteristics of nanostructures are of utmost importance in order to access their suitability as structural members for adoption in various nano-scale devices and systems. In the current analysis, the developed atomistic finite element model for nano-heterostructures is extensively validated first with the results available in literature considering elastic responses and natural frequencies. Thereafter a range of insightful new results are presented for the dynamic behaviour of various configurations of graphene-hBN and graphene-MoS heterostructures including their size, chirality and boundary dependence. The investigation of tunable vibrational properties along with simultaneous modulation of other mechanical, electronic, optical, thermal and chemical attributes of such nano-heterostructures would accelerate their application as prospective candidates for manufacturing nanosensors, electromechanical resonators, and a wide range of other devices and systems across the length-scales.
由于碳基纳米杂化结构具有多种机械性能和其他理想性能的同步调节能力，因此受到越来越多的关注。本文基于原子有限元方法研究了两种不同的基于石墨烯的杂化结构（石墨烯-六方氮化硼（hBN）和石墨烯-二硫化钼（MoS））的振动特性。为了评估它们作为各种纳米尺度器件和系统中结构元件的适用性，了解这些纳米结构的振动特性至关重要。在当前分析中，首先使用文献中提供的弹性响应和固有频率结果对纳米杂化结构的开发原子有限元模型进行了广泛验证。然后，针对各种石墨烯-hBN 和石墨烯-MoS 杂化结构的动态行为提出了一系列新的有见地的结果，包括它们的尺寸、手性和边界依赖性。这种可调谐振动特性的研究以及对其他机械、电子、光学、热学和化学特性的同时调节，将加速这些纳米杂化结构作为制造纳米传感器、机电谐振器以及其他各种器件和系统的有前途的候选材料的应用。
