MXene/Co3O4 composite material: stable synthesis and its enhanced broadband microwave absorption 机翻标题: 暂无翻译,请尝试点击翻译按钮。

2019-10-29

Microwave absorbers serve the purpose to ensure the transmission efficiency and accuracy in 5G telecommunications. Twodimensional MXene has great potential in absorbing microwave. In this study, MXene(Ti3C2Tx)Co3O4 composites are successfully fabricated by a facile and stable hydrothermal treatment in concentrated strong base and Argon environment, followed by a onestep annealing process. Phase composition, chemical state of elements, morphology and structure of the new composite materials are studied by systematical characterization. It is revealed that adsorbed Na ions and terminations, which are generated at the interface during hydrothermal treatment in concentrated NaOH solution, can protect the Ti3C2Tx from being decomposed. The synthesis mechanism is also proposed for stable fabrication of other MXenebased composite materials. The MXeneCo3O4 composite is able to perform singleband absorption, multiband absorption and even broadband absorption in 218 GHz band by tuning its composition and thickness. Particularly, better than 90% absorption in a wide range of 10.817 GHz can be achieved with a thickness of just 2 mm. Enhanced wideband absorption originates from the multilayer structure, the surface defects, the conductivity of Ti3C2Tx and the capacitance structure of Co3O4. Ultrathin and broadband high absorption features make the material a promising candidate for future application.ReferencesJ. G. Andrews, S. Buzzi, W. Choi, S. V. Hanly, A. Lozano, A. C. K. Soong, J. C. Zhang, What will 5G be IEEE Journal on Selected Areas in Communications. 32 (2014)T. S. Rappaport, S. Sun, R. Mayzus, H. Zhao, Y. Azar, K. Wang, G. N. Wong, J. K. Schulz, M. Samimi, F. Gutierrez, Millimeter wave mobile communications for 5G cellular: it will work IEEE Access : Practical Innovations, Open Solutions. 1 (2013)W. Roh, J. Y. 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