You can try using simple and low cost electrochemical exfoliation of polycrystalline graphite rods. You can manipulate of parameters synthesis to obtain graphene flakes with different number of graphene layers. More information you can find in my work:

Article Structure of nanographite synthesized by electrochemical oxi...

thanks sir

If graphene nanoplatelet works for you, then you can use chemical method only. Here is an example.

https://pubs.acs.org/doi/abs/10.1021/acsnano.5b06840