What Drives Metal-Surface Step Bunching in Graphene Chemical Vapor Deposition?
- 12 June 2018
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 120 (24) , 246101
Abstract
Compressive strain relaxation of a chemical vapor deposition (CVD) grown graphene overlayer has been considered to be the main driving force behind metal surface step bunching (SB) in CVD graphene growth. Here, by combining theoretical studies with experimental observations, we prove that the SB can occur even in the absence of a compressive strain, is enabled by the rapid diffusion of metal adatoms beneath the graphene and is driven by the release of the bending energy of the graphene overlayer in the vicinity of steps. Based on this new understanding, we explain a number of experimental observations such as the temperature dependence of SB, and how SB depends on the thickness of the graphene film. This study also shows that SB is a general phenomenon that can occur in all substrates covered by films of two-dimensional (2D) materials.Keywords
Funding Information
- Institute for Basic Science (IBS-R019-D1)
This publication has 54 references indexed in Scilit:
- Strains Induced by Point Defects in Graphene on a MetalPhysical Review Letters, 2013
- Anisotropic graphene growth accompanied by step bunching on a dynamic copper surfaceNanotechnology, 2012
- Repeated growth and bubbling transfer of graphene with millimetre-size single-crystal grains using platinumNature Communications, 2012
- Raman Spectroscopy of Graphene and Bilayer under Biaxial Strain: Bubbles and BalloonsNano Letters, 2011
- Growth and Atomic-Scale Characterizations of Graphene on Multifaceted Textured Pt Foils Prepared by Chemical Vapor DepositionACS Nano, 2011
- Defect-like Structures of Graphene on Copper Foils for Strain Relief Investigated by High-Resolution Scanning Tunneling MicroscopyACS Nano, 2011
- Large-Area Synthesis of High-Quality and Uniform Graphene Films on Copper FoilsScience, 2009
- Large-scale pattern growth of graphene films for stretchable transparent electrodesNature, 2009
- Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis setPhysical Review B, 1996
- Projector augmented-wave methodPhysical Review B, 1994