Multi-scale heterostructures of MXene-based composites for adjustable electromagnetic wave absorption.

Nowadays, electromagnetic pollution caused by the development of communication technology and electronic equipment has become an urgent problem to be solved. It is an effective solution to design high-performance electromagnetic wave absorption (EWA) materials with wide-band and powerful absorption characteristics for electromagnetic protection. In this work, a multi-scale MXene/carbon nanotube@Fe 3 O 4 composite material with a heterogeneous structure was synthesized by a solvothermal method, and the high/low-frequency EWA operating bands were adjusted by component regulation. The composite material performed excellent EWA performances based on the synergistic effect of polarization loss, conductive and magnetic loss, and three-dimensional heterointerfaces. Its minimum reflection loss reached − 59.95 dB with an effective absorption bandwidth of 4.7 GHz (13.3–18 GHz), which basically covered the Ku band. Therefore, this feasible scheme is expected to provide an effective strategy for controlling military and civil electromagnetic pollution. [Display omitted] • A facile preparation method of MXene-based multiscale composites was proposed. • Military/civil EWA operating frequency bands were adjusted by component regulation. • A superior RL min value of − 59.95 dB was obtained based on complex loss mechanisms. [ABSTRACT FROM AUTHOR]