I treated graphene nanoplatelets (GNP, C-750) by sonicating them with a mixture of 50%H2SO4/50%HNO3 (3:1) and washed repeatedly with water until neutral. The idea was to introduce oxygenated functional groups (as -COOH and -OH) on the surface of the graphene layers as confirmed by XPS and XRD. However, when I recorded the RAMAN spectra of both GNP and ox-GNP, the ID/IG value of the acid-treated graphene was lower than the pristine GNP!!!
For GNP: ID/IG=0.72
For acid-treated GNP: ID/IG=0.66
Is it possible that you etched away some of the smaller platelets which had already a high D/G ratio in the educt state so all you see are the bigger ones which survived?
Thank you Jürgen Weippert for your prompt response,
Is there any technique to approve your idea?
I've only seen microscopy studies on it, but of course TEM is expensive and AFM takes a long time, so in any case it would be not simple and straightforward.
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