Open AccessNumerous single‐layer graphene sheets prepared from natural graphite by non‐chemical liquid‐phase exfoliation
Author(s) -
Hsu PingCheng,
Lin TingAn,
Tsai IShou
Publication year - 2014
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2014.0415
Subject(s) - exfoliation joint , graphene , graphite , materials science , chemical engineering , layer (electronics) , graphene oxide paper , phase (matter) , liquid phase , nanotechnology , composite material , organic chemistry , chemistry , physics , engineering , thermodynamics
A simple method was used to produce a high concentration of single‐layer graphene sheets in a single organic solvent system, without using any surfactants. In this experiment, the concentration of single‐layer graphene sheets dispersed in solution increased as the sonication time increased, but damage occurred after performing sonication for 120 min. The concentration of single‐layer graphene sheets was 0.915 mg/ml after sonication for 60 min. According to a transmission electron microscope image, the length of the single‐layer graphene sheets was ∼2–3 μm, and the width was 0.5–1 μm. The perfect single‐layer graphene sheets and the defective single‐layer graphene sheets were distinguished using selected‐area electron diffraction. X‐ray diffraction determined that the two‐theta angle of the numerous single‐layer graphene sheets on a (002) plane was 25.57°, but the ‘one layer’ graphene sheets produced no peak along the (002) plane. According to the Raman spectra, the ratio of I D / I G was 0.3, which indicated that the graphene sheets contained few defects.