Figure 1(a) shows the Raman spectra acquired from different industrial grade Graphene samples showing G and D band. Figure 1(b) shows the spectra of ZnTiO3, Sr2TiMnO6, and CaCu3Ti4O12 respectively. In ZnTiO3 spectrum, 311 and 446 cm-1 are due to the oxygen vibration of Zn–O–Zn, 610 cm-1 corresponds to vibrations of Ti–O–Ti[1]. Convoluted asymmetric peak around 500 cm-1 (475 and 523 cm-1) in Sr2TiMnO6 corresponds to the T2g vibration modes [2]. The Raman lines of CaCu3Ti4O12 at 446, 510 and 572 cm-1 correspond to Ag symmetry and Fg symmetry respectively [3]. Fig 1 (c) shows mapping of reduced GO in which layer numbers are directly related to the IG ratios and the corresponding intensities and peak positions are tabulated in

Fig.1 Raman Spectra of (a) Industrial Graphene Samples (b) different anode materials such as ZnTiO3, Sr2TiMnO6 and CaCu3Ti4O12 and (c) Raman mapping carbon black using Intensity of G peak

Table.1. Single spectra are extracted from different colored regions (which intensity are comparable since all the conditions are same), intensity of G peak is compared to find out the number of layers. G peak values are blue shifted from Graphite as result of functional groups as expected in Graphene oxide and D peak value are also closer to 1350 which is reported to be caused by mixed chains of hydroxyl and epoxy groups in GO. As we can see in the IG map bilayer (yellow) and tri layer (green) are majority of the sample.

SEFCO, Dehradun

SEFCO, Dehradun