期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202111045
关键词
copper sulfide; electromagnetic response; multifunctionality; periodic electroconductive patterns; polyimides
类别
资金
- National Science Foundation of China [51872238, 21806129, 52074227]
- Fundamental Research Funds for the Central Universities [3102018zy045, 3102019AX11]
- Natural Science Basic Research Plan in Shaanxi Province of China [2020JM-118, 2017JQ5116]
- Fund of the State Key Laboratory of Solidification Processing in NPU [SKLSP202001]
- Analytical & Testing Center of Northwestern Polytechnical University
The study introduces a series of polyimide (PI) reinforced composite films with periodic copper-based electroconductive units, showing tunable electrical properties and excellent power loss, multiple scattering, and polarization loss in an alternating electromagnetic field. The obtained films exhibit significant potential as high-performance electromagnetic wave response materials under harsh conditions, with excellent EM shielding performance and specific absorbency value.
Demand for high-efficiency electromagnetic wave (EMW) absorption composite films continues to increase with technical advances in 5G telecommunications, wearable electronics, portable devices, and deployable military applications. However, realizing flexible ultra-thin single-layer EMW absorption composite films with multifunctionality, rather than using traditional particle absorbents, is a known challenge. In this study, the authors propose a series of polyimide (PI) reinforced composite films with periodic copper-based electroconductive units that possess tunable electrical properties for specific applications. These periodic units optimize the electric field distribution of the films in an alternating electromagnetic field, resulting in stronger power loss. Furthermore, the hierarchical structure and abundant heterogeneous interfaces of each unit contribute to multiple scattering and polarization loss. The obtained copper mesh@Cu2-xS@PI (CCP) film shows excellent EM shielding performance (63.7 dB), while the Air@Cu2-xS@PI (ACP) film delivers a superior specific absorbency value of 391.43% mm(-1) in the X-band. Furthermore, owing to their mechanical properties, thermal conduction/dissipation performance, and excellent environmental stability characteristics, these films offer significant potential as high-performance EMW response materials with resistance to harsh conditions.
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