Hello everyone,I was using the method from Nair(DOI: 10.1038/NPHYS2183) to ultrasonic HOPG in an organic solvent(NMP).after 8h sonication,unlike usual graphite which change into graphene suspension,It remains blocks and solvent were still transparent.I don't understand why, can you give me some advise?
The power of ultrasonic bath is the key! It is likely that the power of your ultrasonic bath is too low. Please check the requirements of ultrasonic bath power for dispersing such in your reference or other publications. I believe it should be well above 80 Watts.
You should you stirring if not so through sonication or your sonication power is not same as discussed in paper.
thanks for answer the question. The problem was solved,I was using a juicer,HOPG blocks quickly became small flakes（a few minites)
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