期刊
NATURE MATERIALS
卷 14, 期 7, 页码 714-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4322
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资金
- Office of Basic Energy Sciences of the US Department of Energy [DE-FG02-06ER46293]
- National Science Foundation (NSF) [CMMI 1436375]
- NSF [DMR-0820382, CHE-0946869]
- European Flagship Graphene
- Italian Cariplo Foundation [2011-0373]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1436375] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-FG02-06ER46293] Funding Source: U.S. Department of Energy (DOE)
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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