title: Ti3C2 MXenes with Modified Surface for High-Performance Electromagnetic Absorption and Shielding in the X-Band.
abstract: Electromagnetic (EM) absorbing and shielding composites with tunable absorbing behaviors based on Ti3C2 MXenes are fabricated via HF etching and annealing treatment. Localized sandwich structure without sacrificing the original layered morphology is realized, which is responsible for the enhancement of EM absorbing capability in the X-band. The composite with 50 wt % annealed MXenes exhibits a minimum reflection loss of -48.4 dB at 11.6 GHz, because of the formation of TiO2 nanocrystals and amorphous carbon. Moreover, superior shielding effectiveness with high absorption effectiveness is achieved. The total and absorbing shielding effectiveness of Ti3C2 MXenes in a wax matrix with a thickness of only 1 mm reach values of 76.1 and 67.3 dB, while those of annealed Ti3C2 MXenes/wax composites are 32 and 24.2 dB, respectively. Considering the promising performance of Ti3C2 MXenes with the modified surface, this work is expected to open the door for the expanded applications of MXenes family in EM absorbing and shielding fields.
authors.affiliation: Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an, 710072, China.
authors.forename: Meikang
authors.initials: M
authors.lastname: Han
authors.affiliation: Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an, 710072, China.
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Yin
authors.affiliation: Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an, 710072, China.
authors.forename: Heng
authors.initials: H
authors.lastname: Wu
authors.affiliation: Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an, 710072, China.
authors.forename: Zexin
authors.initials: Z
authors.lastname: Hou
authors.affiliation: Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an, 710072, China.
authors.forename: Changqing
authors.initials: C
authors.lastname: Song
authors.affiliation: Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an, 710072, China.
authors.forename: Xinliang
authors.initials: X
authors.lastname: Li
authors.affiliation: Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an, 710072, China.
authors.forename: Litong
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University , Xi'an, 710072, China.
authors.forename: Laifei
authors.initials: L
authors.lastname: Cheng
keywords: dielectric; electromagnetic shielding; microwave absorption; mxenes; surface modification