Dear Yuvaraj Gopal , the main difference between graphene oxide nanosheets and nanoplatelets is the number of constitutive layers or more specificly, their thickness. The thickness of graphene oxide nanosheets is 0.34-3-4 nm (1-10 layers) but, the thickness of graphene oxide nanoplatelet is 5-25 nm (>10 layers). Besides, GO nanoplatelets often have bigger lateral dimensions (5-20 micrometer) in comparison with GO nanosheets (1-2 micrometer), but its not always true and you might find some exceptions. Furthermore, GO powder does not refer to any particular nanosctructure but refers to the dried grinded GO sample which can be either composed of nanosheets or nanoplatelets. You may also encounter "nanographene oxide" which refers to a type of GO with much smaller lateral dimensions (50-300 nm) comapred to conventional GO.

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With respect to the dispersibility of the aforementioned GO nanostructures in polymer matrix, first of all, the type of polymer must be pin pointed. However, if we consider a hydrophilic polymer like PVA and assume that both nanoplatelets and nanosheets have the same oxidation degree, GO nanosheets provide you with a much better dispersion owing to their smaller sizes. Not to mention, among GO nanosheets, those with fewer layers (1-3 layers) have better dispersibility than those having more layers (4-10 layers). Besides, If you use nanographene oxide instead conventional nanosheets, you will definitely get a much better dispersion. After all, as I stated above, dispersibility of GO depends of the chemical structure of the selected polymer and It is probable that you obtain an unsatisfactory dispersions for those polymers that are incompatible with GO chemical structure.

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Thank you Mahdi Ghamsari for your valuable information.