Wrinkled three-dimensional porous MXene/Ni composite microspheres for efficient broadband microwave absorption

Abstract

In this paper, two dimensional Ti 3 C 2 Tx MXene nanosheets and one-dimensional Ni nanochains are successfully assembled into three dimensional porous MXene/Ni composite microspheres by ultrasonic spray. Their unique micro nano structure and well-designed three-dimensional porous interconnection network can significantly improve the stacking of Ti 3 C 2 Tx MXene nanosheets and the agglomeration of magnetic Ni nanochains. By changing the content of Ni nanochains，we can obtain MXene/Ni composite microspheres with different magnetic content. Due to the difference in conductivity between Ti 3 C 2 Tx MXene and Ni, as well as the newly generated hetero interface and abundant surface groups, MXene/Ni composite microspheres show good impedance matching and excellent electromagnetic wave absorption performance. The minimum reflection loss (RL min ) is −52.7 dB@12.8 GHz, and the corresponding matching thickness is only 1.9 mm. The preparation of MXene/Ni composite microspheres provides a simple and effective method for designing other MXene-based composite materials. • 3D porous MXene/Ni composite microspheres are first formed by simple and rapid ultrasonic spray technology. • MXene/Ni have large specific surface area and abundant pores. • The content of Ni nanochains in MXene/Ni is verified. • The RL min of MXene/Ni is −52.7 dB@12.8 GHz with a thickness of 1.9 mm.