Affiliation:
1. School of Chemistry and Chemical Engineering Northwestern Polytechnical University Xi'an 710072 China
2. Xi'an Key Laboratory of Functional Organic Porous Materials Northwestern Polytechnical University Xi'an 710129 China
3. Shaanxi Engineering and Research Center for Functional Polymers on Adsorption and Separation Sunresins New Materials Co. Ltd. Xi'an 710072 China
Abstract
AbstractThe nitrides and carbides of transition metals are highly favored due to their excellent physical and chemical properties, among which MXene is a hot research topic for microwave absorption. Herein, the controlled preparation of 3D Mo2TiC2Tx‐based microspheres toward microwave absorption is reported for the first time. With the merits of the performances of both reduced graphite oxide (RGO) and MXene sufficiently considered, the influence of carbonization temperature on the internal crystal structure and the effective microwave‐material interaction surface of the prepared Mo2TiC2Tx/RGO is systematically investigated. The structure–activity relationships relating the apparent morphology and crystal structure to the microwave absorption performance are deeply explored, and the wave absorption mechanism is put forward as well. The results show that the Mo2TiC2Tx/RGO‐700 product obtained after heating treatment at 700 °C exhibits excellent microwave absorption performance, with the RLmin being up to −55.1 dB@2.1 mm@13.8 GHz, and the corresponding effective absorption bandwidth covering 5.7 GHz. The outstanding microwave absorption characteristics are attributed to the appropriate impedance matching, high specific surface area, rich intrinsic defects, desirable conductivity, and strong multipolarization capabilities. This work enriches the types of MXene‐based composite absorbers and provides a new strategy for controlled preparation of high‐performance 3D composite absorbers.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Chongqing Municipality
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry