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Journal Articles Nature Materials Year : 2015

Elastic coupling between layers in two-dimensional materials


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.
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hal-01784922 , version 1 (03-05-2018)



Yang Gao, Suenne Kim, Si Zhou, Hsiang-Chih Chiu, Daniel Nelias, et al.. Elastic coupling between layers in two-dimensional materials. Nature Materials, 2015, 14 (7), pp.714 - 720. ⟨10.1038/nmat4322⟩. ⟨hal-01784922⟩
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