Stretchable, Transparent, and Ultra-Broadband Terahertz Shielding Thin Films Based on Wrinkled MXene Architectures
Corresponding Author: Xuchun Gui
Nano-Micro Letters,
Vol. 16 (2024), Article Number: 165
Abstract
With the increasing demand for terahertz (THz) technology in security inspection, medical imaging, and flexible electronics, there is a significant need for stretchable and transparent THz electromagnetic interference (EMI) shielding materials. Existing EMI shielding materials, like opaque metals and carbon-based films, face challenges in achieving both high transparency and high shielding efficiency (SE). Here, a wrinkled structure strategy was proposed to construct ultra-thin, stretchable, and transparent terahertz shielding MXene films, which possesses both isotropous wrinkles (height about 50 nm) and periodic wrinkles (height about 500 nm). Compared to flat film, the wrinkled MXene film (8 nm) demonstrates a remarkable 36.5% increase in SE within the THz band. The wrinkled MXene film exhibits an EMI SE of 21.1 dB at the thickness of 100 nm, and an average EMI SE/t of 700 dB μm−1 over the 0.1–10 THz. Theoretical calculations suggest that the wrinkled structure enhances the film's conductivity and surface plasmon resonances, resulting in an improved THz wave absorption. Additionally, the wrinkled structure enhances the MXene films' stretchability and stability. After bending and stretching (at 30% strain) cycles, the average THz transmittance of the wrinkled film is only 0.5% and 2.4%, respectively. The outstanding performances of the wrinkled MXene film make it a promising THz electromagnetic shielding materials for future smart windows and wearable electronics.
Highlights:
1 A stretchable, transparent, and ultra-broadband (0.1–10 THz) terahertz shielding MXene (Ti3C2Tx) film has been fabricated by a structure engineering strategy.
2 Theoretical calculations indicate that the wrinkled structure enhances the film's conductivity and surface plasmon resonances, resulting in an improved THz wave absorption.
3 The wrinkled MXene films exhibit superb conformability to surfaces with random curvatures, and can be used as a shielding film for THz imaging.
Keywords
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References
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Y. Yu, P. Yi, W. Xu, X. Sun, G. Deng et al., Environmentally tough and stretchable MXene organohydrogel with exceptionally enhanced electromagnetic interference shielding performances. Nano-Micro Lett. 14, 77 (2022). https://doi.org/10.1007/s40820-022-00819-3
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R.B. Schulz, V.C. Plantz, D.R. Brush, Shielding theory and practice. IEEE Trans. Electromagn. Compat. 30, 187–201 (1988). https://doi.org/10.1109/15.3297
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J. Bang, J. Ahn, J. Zhang, T.H. Ko, B. Park et al., Stretchable and directly patternable double-layer structure electrodes with complete coverage. ACS Nano 16, 12134–12144 (2022). https://doi.org/10.1021/acsnano.2c02664
S. Park, J. Bang, B.-S. Kim, S.J. Oh, J.-H. Choi, Metallic fusion of nanocrystal thin films for flexible and high-performance electromagnetic interference shielding materials. Mater. Today Adv. 12, 100177 (2021). https://doi.org/10.1016/j.mtadv.2021.100177
Y.I. Jhon, J.H. Lee, Y.M. Jhon, Surface termination effects on the terahertz-range optical responses of two-dimensional MXenes: density functional theory study. Mater. Today Commun. 32, 103917 (2022). https://doi.org/10.1016/j.mtcomm.2022.103917
L.-X. Liu, W. Chen, H.-B. Zhang, L. Ye, Z. Wang et al., Super-tough and environmentally stable aramid. Nanofiber@MXene coaxial fibers with outstanding electromagnetic interference shielding efficiency. Nano-Micro Lett. 14, 111 (2022). https://doi.org/10.1007/s40820-022-00853-1
J. Wang, X. Ma, J. Zhou, F. Du, C. Teng, Bioinspired, high-strength, and flexible MXene/aramid fiber for electromagnetic interference shielding papers with joule heating performance. ACS Nano 16, 6700–6711 (2022). https://doi.org/10.1021/acsnano.2c01323
Y. Zhu, J. Liu, T. Guo, J.J. Wang, X. Tang et al., Multifunctional Ti3C2Tx MXene composite hydrogels with strain sensitivity toward absorption-dominated electromagnetic-interference shielding. ACS Nano 15, 1465–1474 (2021). https://doi.org/10.1021/acsnano.0c08830
H. Wan, N. Liu, J. Tang, Q. Wen, X. Xiao, Substrate-independent Ti3C2Tx MXene waterborne paint for terahertz absorption and shielding. ACS Nano 15, 13646–13652 (2021). https://doi.org/10.1021/acsnano.1c04656
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Y. Du, Z. Yan, W. You, Q. Men, G. Chen et al., Balancing MXene surface termination and interlayer spacing enables superior microwave absorption. Adv. Funct. Mater. 33, 2301449 (2023). https://doi.org/10.1002/adfm.202301449
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R. Yang, H. Song, Z. Zhou, S. Yang, X. Tang et al., Ultra-sensitive, multi-directional flexible strain sensors based on an MXene film with periodic wrinkles. ACS Appl. Mater. Interfaces 15, 8345–8354 (2023). https://doi.org/10.1021/acsami.2c22158
S. Yang, R. Yang, Z. Lin, X. Wang, S. Liu et al., Ultrathin, flexible, and high-strength polypyrrole/Ti3C2Tx film for wide-band gigahertz and terahertz electromagnetic interference shielding. J. Mater. Chem. A 10, 23570–23579 (2022). https://doi.org/10.1039/D2TA06805B
A. Javili, A.D. Bakiler, A displacement-based approach to geometric instabilities of a film on a substrate. Math. Mech. Solids 24, 2999–3023 (2019). https://doi.org/10.1177/1081286519826370
B. Zhao, C.B. Park, Tunable electromagnetic shielding properties of conductive poly(vinylidene fluoride)/Ni chain composite films with negative permittivity. J. Mater. Chem. C 5, 6954–6961 (2017). https://doi.org/10.1039/C7TC01865G
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