Elastic Response of Graphene Nanodomes
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- 作者：Sascha Koch ; Daniele Stradi ; Enrico Gnecco ; Sara Barja ; Shigeki Kawai ; Cristina D铆az ; Manuel Alcam铆 ; Fernando Mart铆n ; Amadeo Lopez V谩zquez de Parga ; Rodolfo Miranda ; Thilo Glatzel ; Ernst Meyer
- 刊名：ACS Nano
- 出版年：2013
- 出版时间：April 23, 2013
- 年：2013
- 卷：7
- 期：4
- 页码：2927-2934
- 全文大小：510K
- 年卷期：v.7,no.4(April 23, 2013)
- ISSN：1936-086X
文摘
The mechanical behavior of a periodically buckled graphene membrane has been investigated by noncontact atomic force microscopy in ultrahigh vacuum. When a graphene monolayer is grown on Ru(0001), a regular arrangement of 0.075 nm high nanodomes forming a honeycomb lattice with 3 nm periodicity forms spontaneously. This structure responds in a perfectly reversible way to relative normal displacements up to 0.12 nm. Indeed, the elasticity of the nanodomes is proven by realistic DFT calculations, with an estimated normal stiffness k 40 N/m. Our observations extend previous results on macroscopic graphene samples and confirm that the elastic behavior of this material is maintained down to nanometer length scales, which is important for the development of new high-frequency (terahertz) electromechanical devices.