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Journal of Nanomaterials
Volume 2013 (2013), Article ID 101765, 6 pages
http://dx.doi.org/10.1155/2013/101765
Research Article

Thermal Annealing of Exfoliated Graphene

Division of Electricity and Quantum Metrology, National Institute of Metrology, Beijing 100013, China

Received 20 February 2013; Revised 29 March 2013; Accepted 29 March 2013

Academic Editor: Raquel Verdejo

Copyright © 2013 Wang Xueshen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Monolayer graphene is obtained by mechanical exfoliation using scotch tapes. The effects of thermal annealing on the tape residues and edges of graphene are researched. Atomic force microscope images showed that almost all the residues could be removed in N2/H2 at 400°C but only agglomerated in vacuum. Raman spectra of the annealed graphene show both the 2D peak and G peak blueshift. The full width at half maximum (FWHM) of the 2D peak becomes larger and the intensity ratio of the 2D peak to G peak decreases. The edges of graphene are completely attached to the surface of the substrate after annealing.