• 文献标题:   Thinning of large-area graphene film from multilayer to bilayer with a low-power CO2 laser
  • 文献类型:   Article
  • 作  者:   LIN Z, HUANG T, YE XH, ZHONG ML, LI L, JIANG J, ZHANG W, FAN L, ZHU HW
  • 作者关键词:  
  • 出版物名称:   NANOTECHNOLOGY
  • ISSN:   0957-4484
  • 通讯作者地址:   Tsinghua Univ
  • 被引频次:   14
  • DOI:   10.1088/0957-4484/24/27/275302
  • 出版年:   2013

▎ 摘  要

Bilayer graphene has attracted a great deal of attention for many electronic and optical applications. Although large-area bilayer graphene can be synthesized by chemical vapor deposition (CVD), multilayer growth often occurs and subsequent processes are required to obtain uniform bilayer films. We report an efficient way of thinning multilayer graphene film by low-power CO2 laser irradiation in vacuum. With a laser power density of similar to 10(2) W cm(-2), pristine graphene film of 4-5 layers can be thinned to a bilayer free of defects in 30 s. Contrary to previous laser-assisted graphene thinning processes, which reduced graphene layers precisely and locally with a high power density and a small beam diameter, our approach enables high-efficiency thinning of large-area graphene film whilst using a significantly reduced power density and an increased laser beam diameter.