• 文献标题:   Strain Superlattices and Macroscale Suspension of Graphene Induced by Corrugated Substrates
  • 文献类型:   Article
  • 作  者:   RESERBATPLANTEY A, KALITA D, HAN Z, FERLAZZO L, AUTIERLAURENT S, KOMATSU K, LI C, WEIL R, RALKO A, MARTY L, GUERON S, BENDIAB N, BOUCHIAT H, BOUCHIAT V
  • 作者关键词:   graphene, membrane, raman spectroscopy, strain, ripple, suspended graphene
  • 出版物名称:   NANO LETTERS
  • ISSN:   1530-6984 EI 1530-6992
  • 通讯作者地址:   ICFO Inst Ciencies Foton
  • 被引频次:   66
  • DOI:   10.1021/nl5016552
  • 出版年:   2014

▎ 摘  要

We investigate the organized formation of strain, ripples and suspended features in macroscopic CVD-prepared graphene sheets transferred onto a corrugated substrate made of an ordered arrays of silica pillars of variable geometries. Depending on the aspect ratio and sharpness of the corrugated array, graphene can conformally coat the surface, partially collapse, or lay, fakir-like, fully suspended between pillars over tens of micrometers. Upon increase of pillar density, ripples in collapsed films display a transition from random oriented pleats emerging from pillars to ripples linking nearest neighboring pillars organized in domains of given orientation. Spatially-resolved Raman spectroscopy, atomic force microscopy and electronic microscopy reveal uniaxial strain domains in the transferred graphene, which are induced and controlled by the geometry. We propose a simple theoretical model to explain the transition between suspended and collapsed graphene. For the arrays with high aspect ratio pillars, graphene membranes stays suspended over macroscopic distances with minimal interaction with pillars tip apex. It offers a platform to tailor stress in graphene layers and open perspectives for electron transport and nanomechanical applications.