A part of my work deals with GQDs' synthesis and I want to ensure that it is GQD which I have synthesised not CDs..Carbon dots are insulating by nature compared to GQDs.How can I clearly distinguish between two with any one of the easily available characterisation techniques.?
There is no single way for one to ensure his/her products are Graphene Quantum Dots(GQDs) or Carbon dots(CDs). You must make use of several multi-methods to work out this problem, including AFM, TEM combined with SAED. Good luck!
MAybe spectroscopic ellipsometry is also an additional method.
Best regards
Christian
I think with Raman spectra itself you can differentiate it....
because vibration modes for each of them will be different...
No Sivadasan. With Raman spectra alone it is not possible. There is no single characterization technique which can differentiate precisely between CQDs and GQDs so far. I agree with Jie Shan Qiu.
No Sivadasan. With Raman spectra alone it is not possible. Actually the peak position is not that much significant in Raman spectra in the characterization of CQDs and GQDs. Often the two characteristic peaks corresponding to graphitic structure and defect structure will appear at the same wavelength irrespective of the type of CDs (GQDs and CQDs are collectively called as CDs nowadays). What important is the ID/IG ratio. There is no single characterization technique which can differentiate precisely between CQDs and GQDs so far. I agree with Jie Shan Qiu.
Ok thank you.... Mr. RAMANAN VADIVEL ,,I don't know this much precisely.....
But still there are certain advanced characterisation tool like Tip enhanced Raman Spectroscopy (TERS) ...and in that case, with the help of plasmonics, I think we may able to get sufficient signal strength to differentiate it...but I am not very much sure....!
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