Ultralight MXene-Coated, Interconnected SiCnws Three-Dimensional Lamellar Foams for Efficient Microwave Absorption in the X-Band

Xinliang Li; Xiaowei Yin; Hailong Xu; Meikang Han; Minghang Li; Shuang Liang; Laifei Cheng; Litong Zhang

doi:10.1021/acsami.8b13658

Ultralight MXene-Coated, Interconnected SiCnws Three-Dimensional Lamellar Foams for Efficient Microwave Absorption in the X-Band

ACS Appl Mater Interfaces. 2018 Oct 10;10(40):34524-34533. doi: 10.1021/acsami.8b13658. Epub 2018 Sep 25.

Authors

Xinliang Li¹, Xiaowei Yin¹, Hailong Xu¹, Meikang Han¹, Minghang Li¹, Shuang Liang¹, Laifei Cheng¹, Litong Zhang¹

Affiliation

¹ Science and Technology on Thermostructural Composite Materials Laboratory , Northwestern Polytechnical University , Xi'an 710072 , China.

PMID: 30192138
DOI: 10.1021/acsami.8b13658

Abstract

Two-dimensional (2D) few-layered Ti₃C₂T _X MXene (f-Ti₃C₂T _X) has been proved to be one of the most promising electromagnetic interference (EMI) materials, but its electromagnetic (EM) absorption properties and loss mechanism have not been studied so far. Herein, for the first time, ordered lamellar f-Ti₃C₂T _X/SiCnws hybrid foams with ultralow density are synthesized by a combination of self-assembly and bidirectional freezing processes. The freestanding foams exhibit excellent EM absorption properties superior to most of the current foam-based counterparts. The effective absorption bandwidth is always able to cover the whole X-band, when the sample thicknesses of f-Ti₃C₂T _X/SiCnws hybrid foams distribute in any value between 3.5 and 3.8 mm, and the minimum reflection coefficient reaches -55.7 dB at an ultralow density of only about 0.029 g·cm^-3. The fundamental mechanism associated with optimized impedance matching, enhanced polarization loss, and conductive loss is discussed in detail. Our results evidence that 2D flexible f-Ti₃C₂T _X MXene has great potential in EM absorption field like graphene.

Keywords: MXene; SiCnws; bidirectional freezing; microwave absorption; ultralight foam.