▎ 摘　　要

NOVELTY - Composition of matter comprises many graphene platelets that adhere to each other and form the faces of a hollow body. USE - The composition of matter is useful for making nanomaterials. ADVANTAGE - The composition of matter provides relatively pure graphene materials. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for creating the composition of matter, comprising forming graphene platelets on the faces of a magnesium oxide crystal, and then removing the magnesium oxide crystal, with the graphene platelets adhering to each other and forming the faces of a hollow body having a shape corresponding to the shape of the magnesium oxide crystal.