For the synthesis of a polymer composite reinforced by hybrid fillers (graphene Gand nanodiamond ND) by vacuum filtration assisted self-assembly, I want that ND particles stay attached to graphene sheets surface. Is there any interaction between G and ND which ensures this, or do u think that chemical functionalization is required? Do you think that alternative filtration of G, ND suspensions is a good idea? Do you have any suggestions, please? Thank you in advance.