Qu Ning, Yu Zhen, Zhang Jiamin, Han Huichun, Xing Ruizhe, Geng Li, Kong Jie
Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, 710072, P. R. China.
Small. 2025 Feb;21(6):e2409874. doi: 10.1002/smll.202409874. Epub 2024 Dec 31.
The demand for temperature-robust electromagnetic wave (EMW) absorption materials is escalating due to the varying operational temperatures of electronic devices, which can easily soar up to 100 °C, significantly affecting EMW interference management. Traditional absorbers face performance degradation across broad temperature ranges due to alterations in electronic mobility and material impedance. This study presented a novel approach by integrating semiconductor metal-organic frameworks (SC-MOFs) with paraffin wax (PW), leveraging the precise control of interlayer spacing in SC-MOFs for electron mobility regulation and the introduction of paraffin wax for temperature-inert electromagnetic properties. This synergistic strategy enhanced dielectric properties and impedance matching across temperature ranges from ambient to 100 °C. A metamaterial shell layer, designed through finite element simulation and fabricated by 3D printing, encapsulated the composite, resulting in a broadband metamaterial absorber with an 11.81 GHz effective absorption bandwidth and a nearly unchanged absorption peak position across 25-100 °C. This temperature-robust metamaterial absorber paves the way for advanced EMW management materials capable of operating reliably in extreme temperature environments.
由于电子设备的工作温度变化很大，很容易飙升至100°C，这对电磁波干扰管理产生了重大影响，因此对温度稳定的电磁波（EMW）吸收材料的需求正在不断增加。由于电子迁移率和材料阻抗的变化，传统吸收体在很宽的温度范围内都会出现性能下降。本研究提出了一种将半导体金属有机框架（SC-MOFs）与石蜡（PW）相结合的新方法，利用SC-MOFs中间层间距的精确控制来调节电子迁移率，并引入石蜡以实现温度惰性电磁特性。这种协同策略增强了从环境温度到100°C范围内的介电性能和阻抗匹配。通过有限元模拟设计并通过3D打印制造的超材料壳层包裹了该复合材料，从而得到了一种宽带超材料吸收体，其有效吸收带宽为11.81 GHz，在25-100°C范围内吸收峰位置几乎不变。这种温度稳定的超材料吸收体为能够在极端温度环境下可靠运行的先进EMW管理材料铺平了道路。
