Constructing different categories of heterostructured magnetic nanoparticles@carbon nanotubes-reduced graphene oxide, and their tunable excellent microwave absorption capabilities

摘要

In order to simultaneously effective utilization of interface engineering, dielectric loss and magnetic loss attenuation mechanisms, we elaborately constructed and synthesized the mixed-dimensional magnetic nanoparticles (NPs)@carbon nanotubes (CNTs)-reduced graphene oxide (RGO) van der Waals heterostructures (VDWHs) through the catalytic decomposition of C2H2 over FeOOH-RGO. By controlling the decomposition time, different categories and CNTs contents of heterostructured nanohybrids such as Fe3O4@CNTs-RGO, Fe@Fe3C@CNTs-RGO and Fe@Fe2C@CNTs-RGO, which consisted of two-dimensional (2-D) RGO nanosheets, zero-dimensional (0-D) magnetic NPs and one-dimensional (1-D) CNTs, could be selectively synthesized. The obtained results indicated that the as-prepared mixed-dimensional magnetic NPs@CNTs-RGO VDWHs displayed the excellent microwave absorption capabilities, which were proved to be attributed to the quarter-wavelength matching model and good impedance matching. Moreover, because of the improved dielectric loss abilities, values of attenuation constant, defects and/or multiple interfacial polarizations, the obtained Fe@Fe2C@CNTs-RGO samples exhibited evidently enhanced microwave absorption performances. Therefore, a simple and effective route was proposed to synthesize the mixed-dimensional magnetic NPs@CNTs-RGO VDWHs, which provided a new platform for the designing and production of high performance microwave absorption materials. (C) 2019 Elsevier B.V. All rights reserved.