铁单原子在SiOC陶纤维中的演变及其高温和超薄电磁波吸收
Xiaojun Zeng1, Xiaomei Deng1, Zhaoju Yu2
1School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen, China.
Advanced materials (Deerfield Beach, Fla.)
|February 5, 2026
概括
研究人员为高性能电磁波 (EMW) 吸收器开发了一种新的原子级工程策略. 该方法将铁纳米颗粒转化为SiOC陶纤维中的单个原子,增强高温耐受性和低频吸收性,用于先进的隐形和污染控制应用.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 电磁主义 电磁主义
背景情况:
- 高性能电磁波 (EMW) 吸收器对于减轻电磁污染和推进隐形技术至关重要.
- 现有的基于陶的吸收器在实现同时耐高温和有效低频吸收方面面临着挑战.
- 控制粒子状态和理解结构-EMW关系是开发优质EMW吸收材料的关键.
研究的目的:
- 提出和研究一种新的原子级工程策略,用于制造先进的EMW吸收器.
- 控制铁纳米粒子在SiOC陶纤维内转化为单个铁原子的过程.
- 阐明兴奋剂对铁物种进化和电磁行为的影响.
主要方法:
- 利用金属纳米粒子扩散-溶解机制用于原子级工程.
- 采用原子级工程策略来控制Fe纳米粒子在SiOC陶纤维中的Fe单个原子的演变.
- 通过优化源,系统地调查兴奋剂对铁物种和电磁性质的影响.
主要成果:
- 通过原子级工程实现了SiOC陶纤维中的Fe纳米粒子转化为Fe单个原子 (Fe-Nx).
- 通过Fe-Nx相互作用破坏SiOC的局部微观结构对称性,增强极化并使多种损失机制成为可能.
- 在1.60毫米时的反射损失 (RL) 为-59.33dB,有效吸收带宽 (EAB) 为5.5GHz.
- 在高温 (≥500°C) 时表现出显著的EMW吸收性能,RL在4.78 GHz时为-53.2dB.
- SiOC─Fe─CN-10复合材料显示出有利的热扩散特性.
结论:
- 原子级工程策略有效地控制了高性能EMW吸收器的粒子状态.
- 兴奋剂在调节铁物种进化和增强极化损失机制方面发挥着至关重要的作用.
- 开发的SiOC─Fe─CN材料提供了特殊的低频和高温EMW吸收能力,推进了电磁技术.
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