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146 CARBON 54 (2013) 143–148 Fig. 3 – (a) FT-IR spectra (400–3500 cm1) of the RGO and hot pressed graphene sheets with shaded regions representing signal of functional groups. (b) XPS survey scan spectrum of the RGO and hot pressed graphene sheets. (c) C1s spectral region. (d) O1s spectral region. With T fixed at 1500 °C, the D peak intensity started to de- crease with the applied pressure increased and the intensity of the 2D peak was recovered (Figs. 4a and b). At 40 MPa, the D peak has disappeared, showing that defects and functional groups have been removed from the RGO sheets and that the sp2 carbon network has been entirely reconstructed. With pressure fixed at 40 MPa, the D/G intensity ratio decreased as the temperature was increased. At 1500 °C, the D peak was eliminated (Fig. 4c). The G/2D intensity ratio and the Full Width Half Maximum (FWHM) of 2D peak imply that the sam- ple consisted of monolayer, bilayer and few layer of graphene (Fig. 4d). On the basis of statistical sampling of the treated graphene sheets using Raman and AFM, it was estimated that 80% of the product (graphene) sheets were less than five layers. We note that at temperatures between 1000 and 2000 °C and the indicated pressures, single layer or few layer graphene Fig. 4 – Characterizations of the hot pressed graphene sheets using Raman spectroscopy. (a) Raman spectra of hot pressed graphene as a function of the pressure at 1500 °C. (b) D/G ration of hot pressed graphene as a function of the pressure at 1500 °C. (c) Raman spectra of hot pressed graphene as a function of the temperature at 40 MPa pressure. (d) Raman spectra of hot pressed graphene with variant layers.PDF Image | graphene sheets from graphene oxide by hot-pressing
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