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Laminated Ti3C2Tx MXene has been considered as a promising absorbing material. However, microwave absorption (MA) performance of single Ti3C2Tx MXene is always limited. The introduction of magnetic components has been proven to improve impedance matching and MA performance effectively. In this paper, a novel CoNi@Ti3C2Tx composites with various CoNi loading were in-situ fabricated via a simple and low-temperature hydrothermal method. By introducing different contents of CoNi nanoparticles, the electromagnetic (EM) parameters of CoNi@Ti3C2Tx composites are regulated to enhance magnetic loss and improve impedance matching. The CoNi@Ti3C2Tx composites with 40 wt% CoNi nanoparticles showed a strong reflection loss of −58.18 dB at 13.20 GHz as the thickness is only 1.55 mm and a broad effective absorption bandwidth of 5.68 GHz can be achieved. The superior MA performance can be attributed to natural resonance, multiple scattering and reflection of the laminated structure, dipole polarization and interfacial polarization. This low-cost, energy-saving and simple method is significative for microwave absorption applications of MXene-based composite materials.

• Magnetic CoNi-wrapped Ti 3 SiC 2 composites were successfully prepared. • Obvious regulated electromagnetic parameters for the composites can be realized. • The EAB of 4.88 GHz and optimal RL value of −41.41 dB were achieved. The magnetic–dielectric composites with synergetic magnetic and dielectric losses have exhibited great potential in the practical applications of microwave absorbing material. This paper reports a simple low-temperature in situ hydrothermal approach for synthesizing novel composites composed of the dielectric Ti 3 SiC 2 wrapped with magnetic CoNi nanoparticles. The microstructure, morphology, electromagnetic properties, and microwave absorption performance of as-synthesized samples were investigated. By adjusting the content of formed magnetic CoNi nanoparticles on the surface of Ti 3 SiC 2 , obvious regulated frequency-dependence of electromagnetic parameters for the proposed CoNi/Ti 3 SiC 2 composites can be realized. Consequently, the effective absorption bandwidth (RL < −10 dB) and optimal reflection loss value of CoNi/Ti 3 SiC 2 -40 composites under thinner thickness of 1.55 mm can reach up to 4.88 GHz and −41.41 dB, respectively. Exceptional microwave absorption performance of the CoNi/Ti 3 SiC 2 composites is attributed to its simultaneously improved attenuation characteristics and optimized impedance matching, and thus can be undoubtedly identified as high-efficiency microwave absorbing material. [ABSTRACT FROM AUTHOR]

• Magnetic CoNi-alloy-decorated Ti 3 C 2 T x MXene were successfully prepared via mild hydrothermal method. • A broad absorption bandwidth of 5.68 GHz and strong reflection loss of −58.18 dB at 13.20 GHz were achieved in the CoNi@Ti 3 C 2 T x composite with the thickness of only 1.55 mm. • Tailoring microwave electromagnetic parameters and enhancing microwave absorption performance of the CoNi@Ti 3 C 2 T x composite by introducing different contents of CoNi nanoparticles. Laminated Ti 3 C 2 T x MXene has been considered as a promising absorbing material. However, microwave absorption (MA) performance of single Ti 3 C 2 T x MXene is always limited. The introduction of magnetic components has been proven to improve impedance matching and MA performance effectively. In this paper, a novel CoNi@Ti 3 C 2 T x composites with various CoNi loading were in-situ fabricated via a simple and low-temperature hydrothermal method. By introducing different contents of CoNi nanoparticles, the electromagnetic (EM) parameters of CoNi@Ti 3 C 2 T x composites are regulated to enhance magnetic loss and improve impedance matching. The CoNi@Ti 3 C 2 T x composites with 40 wt% CoNi nanoparticles showed a strong reflection loss of −58.18 dB at 13.20 GHz as the thickness is only 1.55 mm and a broad effective absorption bandwidth of 5.68 GHz can be achieved. The superior MA performance can be attributed to natural resonance, multiple scattering and reflection of the laminated structure, dipole polarization and interfacial polarization. This low-cost, energy-saving and simple method is significative for microwave absorption applications of MXene-based composite materials. [ABSTRACT FROM AUTHOR]