Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 43, Pages 24560-24570Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta07781c
Keywords
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Funding
- National Key R&D Program of China [2019YFA0706802]
- National Natural Science Foundation of China [51903223, 52073261, 12072325]
- China Postdoctoral Science Foundation [2018M642781]
- China Scholarship Council (CSC)
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The study developed a flexible NiCo/MX-CNT composite film with high conductivity and strong attenuation capacity by combining various materials to achieve high conductivity and shielding performance simultaneously. The composite film has a high EMI shielding effectiveness and tunability, as well as excellent flexibility and mechanical properties.
Highly conductive Ti3C2Tx MXene-based electromagnetic interference (EMI) shielding materials have shown great application potential in facing the increasingly serious electromagnetic radiation threat but are limited by their single-loss mechanism. Here, to enrich the wave loss mechanism, magnetic Ti3C2Tx MXene and conductive carbon nanotubes (CNTs) have been assembled into a flexible brick-mortar layered NiCo/MX-CNT film to simultaneously obtain high conductivity and strong attenuation capacity. Interestingly, by combining the strong attenuation ability of the magnetic NiCo/MX and high conductivity of CNTs, as well as the dense stacking brick-mortar layered structure, 99.99999991% (90.7 dB of EMI shielding effectiveness, SE) of the electromagnetic waves can be reflected and absorbed by the NiCo/MX-CNT composite film with only 53 mu m thickness, which is one of the best shielding effects achieved and is superior to that of pure CNT film (similar to 71 dB) and pure MXene film (similar to 61 dB), even if they have higher conductivity. Moreover, the composite film can realize EMI shielding property modulation from 46 to 105 dB by adjusting the film thickness from 9 to 116 mu m. The dense stacking brick-mortar layered structure endows the composite film with excellent flexibility, foldability, and robust mechanical properties, which significantly improve the practical potential in complex application environments.
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