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In Situ Atomic Reconstruction Engineering Modulating Graphene-Like MXene-Based Multifunctional Electromagnetic Devices Covering Multi-Spectrum |
Ting-Ting Liu1, Qi Zheng1, Wen-Qiang Cao1, Yu-Ze Wang1, Min Zhang2, Quan-Liang Zhao3, Mao-Sheng Cao1( ) |
1 School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, People’s Republic of China 2 Department of Physics, Beijing Technology and Business University, Beijing, 100048, People’s Republic of China 3 School of Mechanical and Materials Engineering, North China University of Technology, Beijing, 100144, People’s Republic of China |
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Abstract With the diversified development of big data, detection and precision guidance technologies, electromagnetic (EM) functional materials and devices serving multiple spectrums have become a hot topic. Exploring the multispectral response of materials is a challenging and meaningful scientific question. In this study, MXene/TiO2 hybrids with tunable conduction loss and polarization relaxation are fabricated by in situ atomic reconstruction engineering. More importantly, MXene/TiO2 hybrids exhibit adjustable spectral responses in the GHz, infrared and visible spectrums, and several EM devices are constructed based on this. An antenna array provides excellent EM energy harvesting in multiple microwave bands, with |S11| up to − 63.2 dB, and can be tuned by the degree of bending. An ultra-wideband bandpass filter realizes a passband of about 5.4 GHz and effectively suppresses the transmission of EM signals in the stopband. An infrared stealth device has an emissivity of less than 0.2 in the infrared spectrum at wavelengths of 6-14 µm. This work can provide new inspiration for the design and development of multifunctional, multi-spectrum EM devices.
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Received: 24 January 2024
Published: 15 April 2024
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Corresponding Authors:
Mao-Sheng Cao
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About author:: Ting-Ting Liu and Qi Zheng have equally contributed to this work. |
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Fig. 1 Fabrication and microstructure models of MXene/TiO2 hybrids. a Structural evolution process of the MXene/TiO2 hybrids. b-e Morphology of MT-2, MT-3, MT-4 and MT-5. f EDS mappings of MT-5
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Fig. 2 Microstructure characterizations of MXene and MXene/TiO2 hybrids. TEM image of a, b Ti3C2Tx MXene, c MT-2, d MT-3, e MT-4 and f MT-5. g-i HRTEM images of MT-5. j-l Interfaces in MXene/TiO2 hybrids. m AFM image of MT-5. n-p Enlarged view of region I, II and III in m, respectively. q, r The height distribution along the dashed line in n and p, respectively
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Fig. 3 EM response and microwave absorption performance of MXene/TiO2 hybrids. Complex permittivity of a MT-2, b MT-3, c MT-4 and d MT-5. e-h Cole-Cole plots of MT-3. The inserts are the charge difference density images of MT-3 with -OH, -O, and -F and that with Ti-vacancy defect. i, j Simulation images for E-field between two TiO2 nanoparticles, as well as between TiO2 nanoparticle and MXene. RL values of k MT-2, l MT-3, m MT-4 and n MT-5 versus frequency and thickness
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Fig. 4 A multifunctional microstrip antenna array constructed by MXene/TiO2 hybrids. a Structure of the antenna array. b |S11| curves versus frequency. c Minimum |S11| values at different substrate thicknesses. d The maximum gains of MXene/TiO2 hybrids antenna arrays. e Schematic diagram of conformal antenna array. f |S11| curves at different degrees of bending. g Offset of center frequency and increment of gain (relative to unbending antenna array)
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Fig. 5 An UWB bandpass filter constructed by MXene/TiO2 hybrids. a Application scenarios of UWB bandpass filters. |S11| and |S21| curves of b MT-5, c MT-4, d MT-3, and e MT-2 bandpass filters. f-i Surface current distributions in passband. j-m Surface current distributions in stopband
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Fig. 6 a Infrared and visible-light response characteristics of MXene/TiO2 hybrids. a Schematic of infrared stealth and visible-light stealth. The power coefficient of b MT-2, c MT-3, d MT-4 and e MT-5 infrared stealth device. f Thermal infrared images. g Temperature increments under heating conditions. h UV-Vis absorption curves of MXene/TiO2 hybrids. i Enlarged view of the localized area in h. Current density of j MT-2, k MT-3, l MT-4 and m MT-5
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