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Two-dimensional (2D) transition metal carbide MXene-based materials hold great potentials applied for new electromagnetic wave (EMW) absorbers. However, the application of MXenes in the field of electromagnetic wave absorption (EMA) is limited by the disadvantages of poor impedance matching, single loss mechanism, and easy oxidation. In this work, MoO3/TiO2/Mo2TiC2Tx hybrids were prepared by the annealing-treated Mo2TiC2Tx MXene and uniform MoO3 and TiO2 oxides in-situ grew on Mo2TiC2Tx layers. At the annealing temperature of 300 ℃, the minimum reflection loss (RLmin) value of MoO3/TiO2/Mo2TiC2Tx reaches −30.76 dB (2.3 mm) at 10.18 GHz with a significantly broadening effective absorption bandwidth (EAB) of 8.6 GHz (1.8 mm). The in-situ generated oxides creating numerous defects and heterogeneous interfaces enhance dipolar and interfacial polarizations and optimize the impedance matching of Mo2TiC2Tx. Considering the excellent overall performance, the MoO3/TiO2/Mo2TiC2Tx hybrids can be a promising candidate for EMA.


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Ultrabroad band microwave absorption from hierarchical MoO3/TiO2/Mo2TiC2Tx hybrids via annealing treatment

Show Author's information Feiyue HUaFan ZHANGaXiaohan WANGaYaya LIaHailong WANGaRui ZHANGa,bHongxia LIcBingbing FANa( )
School of Material Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
School of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China
Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China

Abstract

Two-dimensional (2D) transition metal carbide MXene-based materials hold great potentials applied for new electromagnetic wave (EMW) absorbers. However, the application of MXenes in the field of electromagnetic wave absorption (EMA) is limited by the disadvantages of poor impedance matching, single loss mechanism, and easy oxidation. In this work, MoO3/TiO2/Mo2TiC2Tx hybrids were prepared by the annealing-treated Mo2TiC2Tx MXene and uniform MoO3 and TiO2 oxides in-situ grew on Mo2TiC2Tx layers. At the annealing temperature of 300 ℃, the minimum reflection loss (RLmin) value of MoO3/TiO2/Mo2TiC2Tx reaches −30.76 dB (2.3 mm) at 10.18 GHz with a significantly broadening effective absorption bandwidth (EAB) of 8.6 GHz (1.8 mm). The in-situ generated oxides creating numerous defects and heterogeneous interfaces enhance dipolar and interfacial polarizations and optimize the impedance matching of Mo2TiC2Tx. Considering the excellent overall performance, the MoO3/TiO2/Mo2TiC2Tx hybrids can be a promising candidate for EMA.

Keywords: impedance matching, dielectric loss, interfacial polarization, MoO3/TiO2/Mo2TiC2Tx composites, Mo2TiC2Tx MXene, electromagnetic wave absorption (EMA)

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Publication history

Received: 05 May 2022
Revised: 10 June 2022
Accepted: 16 June 2022
Published: 05 September 2022
Issue date: September 2022

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© The Author(s) 2022.

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. U2004177 and U21A2064), Outstanding Youth Fund of Henan Province (No. 212300410081), and Support Plan for Scientific and Technological Innovation Talents in Colleges and Universities of Henan Province (No. 22HASTIT001). Bingbing FAN would like to thank The Research and Entrepreneurship Start-up Projects for Overseas Returned Talents.

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