Hi Ranjan,

You will find your answer from the below link.

http://scitation.aip.org/docserver/fulltext/aip/journal/adva/2/3/1.4756995.pdf?expires=1455635859&id=id&accname=guest&checksum=F2371435895A1EF88D5BCF3AC26E8907

file:///C:/Users/owner/Downloads/RAMAN%20SPECTROSCOPY%20OF%20GRAPHENE%20AND.pdf

Respected Sir,

Can you please again share the link as it shows page not find everytime

Hope you will find this time.

1) https://www.physics.purdue.edu/quantum/files/Raman_Spectroscopy_of_Graphene_NOVA_Childres.pdf

2) AIP Advances 2, 032183 (2012); http://dx.doi.org/10.1063/1.4756995

Thank you sir for your valuable suggestion. I found the paper and it's very helpf

Noboby knows how to exactly use Raman spectroscopy for GO, due to its singular and dynamic nature. Many other bands are ignored, I considered at least 5 or 6 bands of great concern. Here I pointed out that the festures at around 1700-1800 cm-1 are referred to non-regular rings (Stone-wales defects, holes, cavities, 5-7-7-5 or 5-8-5 rings).

http://www.sciencedirect.com/science/article/pii/S0266353815301032

There are even other spectral features before D-band, between D and G and so on, which are very useful to understand the wide variety of oxygenated moieties within GO honeycomb. Remember: GO structure DOES NOT POSSESS only alcoholic, epoxy and carboxyl moieties, as many researchers said. The aromatic domains around -OH and -COOH end groups leads to the formation of a singular, strange and highly variegated chemical environment. Do you need to get some quick confirmation? Well, if you put into water a little of GO, pH becomes highly acidic. Carboxyls are less than 10% and pKa of -COOH is about 4.5-5.5. So, how could one explain its strong acidity?

 #Andrea Maio: Sir you mentioned about 5 or 6 bands are of great concern. Can you share some more ideas about the bands. Also it's very interesting that GO shows acidic behavior. I would try this out.

It will be very helpful to me if you can share some more experience of  GO.

#Sujoy Sarkar: SIr would you like to add something to what Andrea Maio sir said.

According to Andrea's question; how could one explain its strong acidity? I would suggest you to go through the article mentioned below. Hope you will understand.

J. Phys. Chem. Lett. 2012, 3, 867−872

Regarding different bands  present in GO, is explained in the article I shared before.

#Sujoy Sarkar: Thanks a lot sir, you have cleared many doubts of mine.

This link is really useful,

http://www.instanano.com/characterization/experimental/raman-graphene/