Effects of low power CO2 laser irradiation on structure of multilayer graphene

Jiangyou Long, Ting Huang, Xiaohui Ye, Zhe Lin, Minlin Zhong, Juan Jiang, Lin Li

Research output: Contribution to journalArticlepeer-review

Abstract

Multilayer graphene generated by chemical vapor deposition (CVD) method is irradiated by CO2 laser in vacuum with different power densities and irradiation time. Raman spectroscopy is used to clarify the influences of laser power density and irradiation time on the structure modification. At a laser power density of 13 W/cm2, the decrease of D-band and the increase of G-band intensity are due to the reduction of defects. In contrast, the sample irradiated with higher power density shows that the D-band intensity increase dramatically caused by the laser thermal effects. Nanocrystalline graphene is formed as the defects after irradiation at higher power desities. With increasing irradiation time to 120 s, amorphous carbon is formed at the surface of graphene at a lase power density of 58 W/cm2. These results show that proper irradiation of CO2 laser can improve the charactervstics of graphene.

Original languageEnglish
Article number1206001
JournalZhongguo Jiguang/Chinese Journal of Lasers
Volume39
Issue number12
DOIs
Publication statusPublished - 2012 Dec
Externally publishedYes

Keywords

  • CO laser irradiation
  • Graphene
  • Laser techology
  • Raman spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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