Probing the shear modulus of two-dimensional multiplanar nanostructures and heterostructures

Abstract

Generalized high-fidelity closed-form formulae have been developed to predict the shear modulus of hexagonal graphene-like monolayer nanostructures and nano-heterostructures based on a physically insightful analytical approach. Hexagonal nano-structural forms (top view) are common for nanomaterials with monoplanar (such as graphene and hBN) and multiplanar (such as stanene and MoS2) configurations. However, a single-layer nanomaterial may not possess a particular property adequately, or multiple desired properties simultaneously. Recently, a new trend has emerged to develop nano-heterostructures by assembling multiple monolayers of different nanostructures to achieve various tunable desired properties simultaneously. Shear modulus assumes an important role in characterizing the applicability of different two-dimensional nanomaterials and heterostructures in various nanoelectromechanical systems such as determining the resonance frequency of vibration modes involving torsion, wrinkling and rippling behavior of two-dimensional materials. We have developed mechanics-based closed-form formulae for the shear modulus of monolayer nanostructures and multi-layer nano-heterostructures. New results of shear modulus are presented for different classes of nanostructures (graphene, hBN, stanene and MoS2) and nano-heterostructures (graphene-hBN, graphene-MoS2, graphene-stanene and stanene-MoS2), which are categorized on the basis of fundamental structural configurations. The numerical values of shear modulus are compared with the results from the scientific literature (as available) and separate molecular dynamics simulations, wherein a good agreement is noticed. The proposed analytical expressions will enable the scientific community to efficiently evaluate shear modulus of a wide range of nanostructures and nanoheterostructures.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Boron compounds; Elastic moduli; Elasticity; Graphene; Layered semiconductors; Molecular dynamics; Molybdenum compounds; Monolayers; Nanostructured materials; Nanostructures; Nitrogen compounds; Shear strain; Vibrations (mechanical), Analytical expressions; Closed-form formulae; Molecular dynamics simulations; Nano-heterostructures; Resonance frequencies; Scientific literature; Structural configurations; Two-dimensional materials, Sulfur compounds

International Standard Serial Number (ISSN)

2040-3364; 2040-3372

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2018 Royal Society of Chemistry, All rights reserved.

Publication Date

01 Mar 2018

Link to Full Text

Share

 
COinS