Elastic coupling between layers in two-dimensional materials
- Authors
- Gao, Yang; Kim, Suenne; Zhou, Si; Chiu, Hsiang-Chih; Nelias, Daniel; Berger, Claire; de Heer, Walt; Polloni, Laura; Sordan, Roman; Bongiorno, Angelo; Riedo, Elisa
- Issue Date
- Jul-2015
- Publisher
- NATURE PUBLISHING GROUP
- Keywords
- GRAPHENE OXIDE; EPITAXIAL GRAPHENE; MULTILAYER GRAPHENE; FORCE MICROSCOPY; CONTACT AREA; HALF-SPACE; FRICTION; FILMS; SHEAR; TRANSPARENT
- Citation
- NATURE MATERIALS, v.14, no.7, pp.714 - 720
- Indexed
- SCIE
SCOPUS
- Journal Title
- NATURE MATERIALS
- Volume
- 14
- Number
- 7
- Start Page
- 714
- End Page
- 720
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/17844
- DOI
- 10.1038/NMAT4322
- ISSN
- 1476-1122
- Abstract
- Two-dimensional materials, such as graphene and MoS2, are films of a few atomic layers in thickness with strong in-plane bonds and weak interactions between the layers. The in-plane elasticity has been widely studied in bending experiments where a suspended film is deformed substantially; however, little is known about the films' elastic modulus perpendicular to the planes, as the measurement of the out-of-plane elasticity of supported 2D films requires indentation depths smaller than the films' interlayer distance. Here, we report on sub-angstrom-resolution indentation measurements of the perpendicular-to-the-plane elasticity of 2D materials. Our indentation data, combined with semi-analytical models and density functional theory, are then used to study the perpendicular elasticity of few-layer-thick graphene and graphene oxide films. We find that the perpendicular Young's modulus of graphene oxide films reaches a maximum when one complete water layer is intercalated between the graphitic planes. This non-destructive methodology can map interlayer coupling and intercalation in 2D films.
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Collections - COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY > DEPARTMENT OF PHOTONICS AND NANOELECTRONICS > 1. Journal Articles
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