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Elastic coupling between layers in two-dimensional materials

Title
Elastic coupling between layers in two-dimensional materials
Author
김수은
Keywords
GRAPHENE OXIDE; EPITAXIAL GRAPHENE; MULTILAYER GRAPHENE; FORCE MICROSCOPY; CONTACT AREA; HALF-SPACE; FRICTION; FILMS; SHEAR; TRANSPARENT
Issue Date
2015-07
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE MATERIALS, v. 14, No. 7, Page. 714-720
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.
URI
https://www.nature.com/articles/nmat4322http://repository.hanyang.ac.kr/handle/20.500.11754/100960
ISSN
1476-1122; 1476-4660
DOI
10.1038/nmat4322
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ETC > 연구정보
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