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

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 (RLmin) 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. (C) 2021 Elsevier Ltd. All rights reserved.