Graphene materials were synthesized from multiwall carbonnanotubes (MWCNTs) via the longitudinal unzipping method [16].Using these GNRox (44% wt. oxygen content), the chemical reduction with N2H4/NH3 [26] yielded GNRred (14% wt. oxygen content). These carbon nanomaterials have been previously characterized [22]. Briefly, GNR features could be summarized as follows (see Table 1): using atomic force microscopy (AFM), GNRox showed height profiles of 0.8nm (with sizes of layers of 200 nm x 150 nm) while in GNRred the height was 1.2nm (withsizes of layers of 120 nm x 50 nm), suggesting the presence of one and three layers in GNRox and GNRred, respectively. Considering
the results obtained by XPS, Raman and IR spectroscopy techniques, GNRox showed high percentage of carboxyl and alcohol groups while the content of sp2 carbons and defects in the structure was increased in GNRred. Furthermore, Raman data showed the presence of additional edges (more defects) and small layers in GNRred, being consistent with the results found in AFM.