The Raman spectra is related to Graphene oxide (GO) which is heat treated in 320 C and I am not sure if it's oxygen content has decreased and GO has turned to Graphene (I speculated this based on TGA of GO).
It looks G-band is there, Intense D-band tells good graphene structure, you can try with large integration time for better G-band intensity.
@Ram Krishna
Thanks so much! so graphene is there. how can I determine whether it is GO or Gr?
could you please elaborate more on your view [integration time]?
@Parvathalu
Thanks. I contacted the operator of Raman Spectrometer and hope it will work.
So you think that G band is overlapped by D band?
Reduction of GO to Gar can be observed in Raman spectrum, and calculated using the changes in related intensity (integrated area) of two peaks, namely D and G.
These articles might be helpful:
Jorio, Ado. "Raman spectroscopy in graphene-based systems: Prototypes for nanoscience and nanometrology." ISRN Nanotechnology 2012 (2012).
https://www.osapublishing.org/view_article.cfm?gotourl=https%3A%2F%2Fwww%2Eosapublishing%2Eorg%2FDirectPDFAccess%2F9B71DCD7-CE3F-69FA-FB077A72D5A30EBC_240528%2Foe-20-17-19463%2Epdf%3Fda%3D1%26id%3D240528%26seq%3D0%26mobile%3Dno&org=
Integration time you can increase while taking spectra, (15s or 20s or more), this will help in getting statistically high intensity peaks which are weaker and by higher integration time you are allowing the system to get higher number of counts.
Thanks Mr. Krishna for providing helpful guidance.
I was browsing the web and I had ended up in places like this:
http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b01590
my confusion arose when I saw no clue about G band.
I called the operator and asked to repeat the Raman spectroscopy for my sample. I am a bit suspicious of Fe2O3 present in my hybrid material and its impact on my Raman spectra.
In the link 'http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b01590,
I can see G-band@~1580 cm-1
Also, there is the presence of D" band shifting to lower wavenumber with a decrease in O-content...
F2O3 - possibly not impact the GO Raman, (but please check this)
G-band is in plane graphene mode. But You have oxide and no in plane C-C bonds.
@Eugene F Kislyakov
Though I cannot imagine the not being of any in plane C-C bond, Thanks Mr. Kislyakov for your reasonable answer. What is your idea about the origin of my D band?
Try to anneal the sample in presence of inert atmosphere at 450 Celsius and carry out Raman analysis again.
Increase in annealing temperature results in decreasing defect related to carbon and in plane SP2 bonded carbon of GO.
@Sunill Meti
Thanks for your consideration. If you look at GO TGA curve, I have limitations doing this.
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