High-permittivity Solvents Increase MXene Stability and Stacking Order Enabling Ultraefficient Terahertz Shielding
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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Advanced Science, Volume 11, issue 5
Abstract
2D transition metal carbides and nitrides (MXenes) suggest an uncommonly broad combination of important functionalities amongst 2D materials. Nevertheless, MXene suffers from facile oxidation and colloidal instability upon conventional water-based processing, thus limiting applicability. By experiments and theory, It is suggested that for stability and dispersibility, it is critical to select uncommonly high permittivity solvents such as N-methylformamide (NMF) and formamide (FA) (εr = 171, 109), unlike the classical solvents characterized by high dipole moment and polarity index. They also allow high MXene stacking order within thin films on carbon nanotube (CNT) substrates, showing very high Terahertz (THz) shielding effectiveness (SE) of 40–60 dB at 0.3–1.6 THz in spite of the film thinness < 2 µm. The stacking order and mesoscopic porosity turn relevant for THz-shielding as characterized by small-angle X-ray scattering (SAXS). The mechanistic understanding of stability and structural order allows guidance for generic MXene applications, in particular in telecommunication, and more generally processing of 2D materials.Description
Funding Information: O.I. acknowledges support by the research European Research Council Advanced Grant DRIVEN (No. 742829) and Academy of Finland Center of Excellence Program in Life‐inspired Hybrid Materials, LIBER (No. 346108). Z.‐P.L. acknowledges support from Academy of Finland (No. 330214). B.P. acknowledges support by the Academy of Finland (No. 321443 and 328942). Z.L. acknowledges support from the China Scholarship Council (No. 201906310141). Z.X. acknowledges support from the China Scholarship Council (No. 202008440534). J.S. acknowledges support from the China Scholarship Council (No. 202008440311). A.P.Ts. acknowledges the Magnus Ehrnrooth Foundation (the Finnish Society of Sciences and Letters) for personal financial support. The authors acknowledge Jani Sainio and Meinander Kristoffer for XPS measurement, Lide Yao for preparation of cross‐sectional sample film cut by FIB, and Hua Jiang for assistance in transmission electron microscopy characterizations, respectively, and the facilities and technical support provided by Aalto University OtaNano‐Nanomicroscopy Center, Bioeconomy and Raw Matters Research Infrastructures. The authors also thank Jin Zhang for the valuable discussion on THz measurement. | openaire: EC/H2020/742829/EU//DRIVEN
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Hong, X, Xu, Z, Lv, Z P, Lin, Z, Ahmadi, M, Cui, L, Liljeström, V, Dudko, V, Sheng, J, Cui, X, Tsapenko, A P, Breu, J, Sun, Z, Zhang, Q, Kauppinen, E, Peng, B & Ikkala, O 2024, 'High-permittivity Solvents Increase MXene Stability and Stacking Order Enabling Ultraefficient Terahertz Shielding', Advanced Science, vol. 11, no. 5, 2305099. https://doi.org/10.1002/advs.202305099