摘要
Two-dimensional materials, such as graphene and MoS 2, 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-ångström-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.
原文 | 英語 |
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頁(從 - 到) | 714-720 |
頁數 | 7 |
期刊 | Nature Materials |
卷 | 14 |
發行號 | 7 |
DOIs | |
出版狀態 | 已發佈 - 2015 7月 24 |
ASJC Scopus subject areas
- 化學 (全部)
- 材料科學(全部)
- 凝聚態物理學
- 材料力學
- 機械工業