What is the significance of the ratio of D to G peak in the Raman spectra of mono/few layered graphene?

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Vladimir A. Basiuk

The significance is the same as for any carbon material: higher D band intensity and lower G band intensity imply more disorder (sp3 hybridized C atoms) as compared to the ideal graphene lattice (with pure sp2 hybridization, no D band must be observed).

Chandra Bhal Singh

As Dr Basiuk already explained. I am attaching 2 articles in which ratio of Raman D to G peak of graphene discussed.

You should read this discussion in given link

https://www.researchgate.net/post/D_G_ratio_of_graphene_oxide_and_its_relation_with_sp2_sp3_carbon_ratio

Md.Akibul Islam

Thank you all for your kind reply. It was really helpful