▎ 摘　　要

NOVELTY - A sea urchin type microstructure manganese dioxide composite graphene nanosheet powder comprises a hollow sea urchin-like manganese dioxide which is grown on the graphene nanosheet with single sheet thickness of 0.55-3.74 nm. The particle size of the hollow sea urchin-like manganese dioxide is 2-8 µm. The hollow sea urchin-like manganese dioxide contacts with each other to form a network structure. USE - Sea urchin type microstructure manganese dioxide composite graphene nanosheet powder used as wave absorbing material (claimed). ADVANTAGE - The sea urchin-type micro-structure manganese dioxide composite graphene nano-sheet powder is capable of optimizing impedance matching performance, and has excellent electromagnetic wave absorbing performance and low density. The sea urchin-type micro-structure manganese dioxide composite graphene nano-sheet powder is prepared by simple and economical method. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: manufacture of the sea urchin type microstructure manganese dioxide composite graphene nanosheet powder; and use of sea urchin type microstructure manganese dioxide composite graphene nano-sheet powder, in which one-dimensional manganese oxide in the outer layer of hollow sea urchin-shaped manganese dioxide in the sea urchin-type microstructured manganese dioxide composite graphene nanosheet powder is used as an antenna to induce a microcurrent to increase the loss of incident electromagnetic waves, thereby using as wave absorbing material or as transition layer for electromagnetic waves to enter the material interface to improve impedance matching.