Ultrasmall Fe3O4 nanoparticles on MXenes with high microwave absorption performance

Herein, 2D hierarchical composites of nano-sized Fe3O4 particles on MXenes (TiO2/Ti3C2Tx/Fe3O4) were synthesized by using a moderate hydrothermal reaction. Electron microscope techniques indicated that the surfaces of MXenes were densely covered with Fe3O4 nanoparticles of similar to 4.9 nm. Microwave absorption capabilities in terms of the maximum reflection loss (R-L) and effective bandwidth were investigated. Specifically, the TiO2/Ti3C2Tx/Fe(3)O(4)( )exhibited a remarkable absorption performance, with a maximum reflectivity of -57.3 dB at 10.1 GHz and a band range below -10 dB to over 9.1-11.1 GHz at a thickness of 1.9 mm. Therefore, our 2D MXene composites are expected to be promising candidates as ultrathin and lightweight absorbing materials. (C) 2018 Elsevier B.V. All rights reserved.