Raman spectra often have two major bands, D band, which is a breathing mode of ƙ-point phonons of the A1g symmetry; and G band, which is assigned to the E2g phonon of the sp2 C atoms. The prominent D band in the Raman spectrum is an indication of the graphene sheet disorder that originates from the sp3 C atoms in the sp2 C network and/or heteroatoms associated. Therefore, the value of ID/IG is the main component of Raman analysis for graphene materials characterization. Although you already mentioned that the peak position appears at nearly same wavenumber, you also need to take the shift (red or blue) into account for better characterization.

You may not get any exact value of Raman peaks for graphene or GO.

For better understanding, you can observed some articles on graphene materials.

http://pubs.rsc.org/en/content/articlepdf/2014/NR/C4NR00655K

http://pubs.rsc.org/en/content/articlepdf/2012/JM/C2JM33114D

http://pubs.rsc.org/en/content/articlepdf/2010/JM/B919074K

http://www.sciencedirect.com/science/article/pii/S0378775317313782

Thanks.

The main parameter is the ID/IG ratio in Raman spectroscopy to determine the difference between GO and rGO. After reduction of the GO, ID/IG ratio increases slightly due to the removal of the functional groups in GO and defects in the structure.

Thank you for your reply Sir.