I have exfoliated graphite in DI water for couple of hours but by doing this I am getting much higher intensity D' peak than G band
Graphite is not the only carbon material able to exfoliate. Did you really started with graphite ? How did you do the experiment ? Another possibility is that you used a very powerful laser, heating tremendously the carbon locally. Please check the surface of the sample after acquisition, and see if there is no damage. Carbon is a very absorbing material, so the power of the laser must be extremely low. Otherwise, the material progressively (but rapidly) transforms in the laser beam, giving unexpected Rama spectra. I suggest that you repeat the experiment with a 100 times lower laser power at least.
Alain
Yes, there are many possibilities in this context. First we have to understand the method used and characterization conditions. I do agree with Prof. Alain.
I have done the exfoliation of graphite by ultra-sonication method. I have taken 1.5 g of graphite in 300 mL DI water and then sonicated it for 6 hours at 140 W power, but during the ultrasonication the temperature of the ultrasonication bath increased from room temp to 65 degree centigrade.Is it the heating responsible for such absurd peak in my graphite sample?
I'm sorry, but still I don't understand.
Graphite must be intercalated before it can be exfoliated. Exfoliation doesn't occur spontaneously only by applying ultrasounds to graphite. What you did rather looks like a kind of grinding.
Which kind of graphite did you use, was it pure ? If pure, no exfoliation could occur but a kind of abrasion leading to smaller particles.
Alain
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