Adsorbate-Induced Curvature and Stiffening of Graphene

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• 作者：Simon A. Svatek ; Oliver R. Scott ; Jasmine P.H. Rivett ; Katherine Wright ; Matteo Baldoni ; Elena Bichoutskaia ; Takashi Taniguchi ; Kenji Watanabe ; Alexander J. Marsden ; Neil R. Wilson ; Peter H. Beton
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：January 14, 2015
• 年：2015
• 卷：15
• 期：1
• 页码：159-164
• 全文大小：339K
• ISSN：1530-6992

文摘

The adsorption of the alkane tetratetracontane (TTC, C₄₄H₉₀) on graphene induces the formation of a curved surface stabilized by a gain in adsorption energy. This effect arises from a curvature-dependent variation of a moir茅 pattern due to the mismatch of the carbon鈥揷arbon separation in the adsorbed molecule and the period of graphene. The effect is observed when graphene is transferred onto a deformable substrate, which in our case is the interface between water layers adsorbed on mica and an organic solvent, but is not observed on more rigid substrates such as boron nitride. Our results show that molecular adsorption can be influenced by substrate curvature, provide an example of two-dimensional molecular self-assembly on a soft, responsive interface, and demonstrate that the mechanical properties of graphene may be modified by molecular adsorption, which is of relevance to nanomechanical systems, electronics, and membrane technology.