Characterization of Graphene Sheets Formed by the Reaction of Carbon Monoxide with Aluminum Sulfide

Abstract

Graphene sheets formed by the reaction of carbon monoxide (CO) with aluminum sulfide (Al(2)S(3)) at reaction temperatures >= 800 degrees C were characterized by X-ray diffraction (XRD), Raman spectroscopy, and high-resolution transmission electron microscopy (HRTEM). The graphene sheets, formed as CO was reduced to gaseous carbon by the reaction with Al(2)S(3), in the temperature range 800 - 1100 degrees C, did not exhibit their characteristic XRD peaks because of the small number of graphene layers and/or low crystallinity of graphene sheets. Raman spectra of graphene sheets showed that the intensity ratio of the D band to the G band decreased and the 2D band was shifted to higher frequencies with increasing reaction temperature, indicating that the number of graphene layers increased with increasing reaction temperature.