Comparative study between the fracture stress of poly‐ and single‐crystalline graphene using a novel nanoelectromechanical system structure. (1st November 2017)

• Record Type: Journal Article
• Authors: Ng, Jimmy; Chen, Qi; Xie, Ya‐Hong; Wang, Albert; Wu, Tianru
• Is Part Of: Micro & nano letters. Volume 12:Number 11(2017)
• Page Start: 907
• Page End: 912
• Publication Date: 2017-11-01
• Subjects: fracture -- graphene -- grain boundaries -- monolayers -- chemical vapour deposition -- graphene devices -- nanoelectromechanical devices; fracture stress -- polycrystalline graphene -- single‐crystalline graphene -- two‐dimensional carbon material -- mechanical properties -- grain boundaries -- monolayer graphene -- novel nanoelectromechanical system structure -- suspended graphene ribbon devices -- electrostatical actuation -- graphene sheet -- nail structures -- electromechanical responses -- hnite element simulations -- novel NEMS structure -- chemical vapour deposition -- local feeding CVD -- C; Nanotechnology -- Periodicals; Nanostructures -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1049/mnl.2017.0422
• Languages: English
• ISSNs: 1750-0443

Abstract

Abstract : Graphene is a two‐dimensional carbon material with extraordinary mechanical properties. However, recent studies have found that the presence of grain boundaries significantly decreases fracture stress of graphene, warranting further investigation. This work reports the development of a new method to measure the fracture stress of monolayer graphene with a novel nanoelectromechanical system (NEMS) structure. Suspended graphene ribbon devices with a range of geometries were electrostatically actuated while the graphene sheet was pinned down with various nail structures. By recording the electromechanical responses at fracture and using finite element simulations, the fracture stress was calculated. Using this novel NEMS structure, the fracture stress of polycrystalline graphene grown using conventional chemical vapour deposition (CVD) and single‐crystalline graphene grown using local feeding CVD were found to be ∼30 and ∼90 GPa, respectively.