Challenges and future prospects of the 2D material-based composites for microwave absorption.

The widespread use of electronic devices inevitably brings about the problem of electromagnetic pollution. As a result, it is important and urgent to develop efficient absorbing materials to alleviate increasing pollution issues. Recently, two-dimensional (2D) material-based microwave absorbers have attracted wide attention in microwave absorption due to their unique lamellar structure, large specific surface area, low density, good thermal and chemical stability. Through various modulation strategies such as structure configuration, pore/defect engineering, heteroatom doping and coupling of functional materials, 2D materials or 2D material-based composites exhibit excellent microwave absorption performance. In this review, the absorption mechanism is firstly introduced and then the latest progress in 2D material-based microwave absorbers is reviewed in depth. The challenges and future prospects for graphene, h-BN, and MXene-based microwave absorbers are discussed in the final part. This timely review aims to provide guidance or stimulation to develop advanced multifunctional 2D material-based microwave absorbers in this rapidly blossoming field.