title: Hierarchical graphene@Fe3O4 nanocluster@carbon@MnO2 nanosheet array composites: synthesis and microwave absorption performance.
abstract: The fabrication of novel hierarchical graphene@Fe3O4 nanocluster@carbon@MnO2 nanosheet array composites has been successfully carried out for the first time. The fabrication process involves the deposition of Fe3O4 nanoclusters on graphene's surface using a simple in situ hydrothermal method, subsequent introduction of carbon on the surface of graphene@Fe3O4 nanoclusters by combining the hydrothermal reaction and thermal treatment process, and finally formation of the hierarchical composites via a simple in situ redox replacement reaction between potassium permanganate (KMnO4) and carbon on the surface of graphene@Fe3O4 nanoclusters. Moreover, the microwave absorption properties of both graphene@Fe3O4 nanoclusters and hierarchical graphene@Fe3O4 nanocluster@carbon@MnO2 nanosheet array composites were investigated between 2 and 18 GHz microwave frequency bands. The electromagnetic data demonstrate that graphene@Fe3O4 nanocluster@carbon@MnO2 nanosheet array hierarchical composites exhibit significantly enhanced microwave absorption properties compared with graphene@Fe3O4 nanoclusters, which probably originate from the unique hierarchical structure and larger surface area.
authors: Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an, P. R. China. yingh@nwpu.edu.cn.
authors: Lei
authors: L
authors: Wang
authors: Ying
authors: Y
authors: Huang
authors: Chao
authors: C
authors: Li
authors: Junjiao
authors: J
authors: Chen
authors: Xu
authors: X
authors: Sun