Reduction of graphite oxide to graphene with laser irradiation

• Published in: Carbon (New York) 2013-02, Vol.52, p.574-582
• Main Authors: Trusovas, Romualdas, Ratautas, Karolis, Račiukaitis, Gediminas, Barkauskas, Jurgis, Stankevičienė, Inga, Niaura, Gediminas, Mažeikienė, Regina
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Dynamics; Exact sciences and technology; Fullerenes and related materials; diamonds, graphite; Graphene; Irradiation; Lasers; Materials science; Nanostructure; Oxides; Physical radiation effects, radiation damage; Physics; Reduction; Specific materials; Structure of solids and liquids; crystallography; Surface treatments; Two dimensional; Ultraviolet, visible, and infrared radiation effects (including laser radiation)
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/j.carbon.2012.10.017

Reduction of graphite oxide (GO) to graphene induced by picosecond pulsed laser irradiation has been studied by Raman spectroscopy, scanning electron microscopy together with modeling of temperature dynamics in the materials. Dependence of the D, G, and 2D Raman band parameters on the laser pulse energy and the irradiation dose was evaluated. The exponential decline of the full width at half maximum of the Raman lines with increasing product of the pulse energy and irradiation dose was observed indicating ordering in the film and reduction in the number of graphene layers during the laser treatment. The minimum concentration of structural defects and the largest relative intensity of the 2D peak were found for the 50mW mean laser power and the 30mm/s scanning speed. Modeling of temperature dynamics revealed that the temperature of the GO film irradiated with a single laser pulse at a fluence of 0.04J/cm2 (50mW) increased up to 1400°C for a few nanoseconds, which was sufficient for the effective reduction of GO to graphene with successive laser pulses.