来自生物质的多孔碳材料用于可调节的微波吸收,具有出色的低频性能
ACS applied materials & interfaces
|June 30, 2025
概括
研究人员从玉米中设计了化多孔碳材料,以实现可调节的微波吸收 (MA). 这一创新使得5G和雷达能够有效地吸收低频C频段,并提供高频Ku频段的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 电磁学 电磁学 电磁学 电磁学
- 可持续化学 可持续化学
背景情况:
- 来自生物质的多孔碳 (BPC) 显示了微波吸收 (MA) 的潜力.
- 目前的BPC材料主要吸收中高频,限制5G和雷达等低频应用.
- 为特定频段 (尤其是较低频段) 量身定制BPC是一个重大挑战.
研究的目的:
- 开发一种用于调整BPC材料微波吸收频率的新策略.
- 在潮湿和腐蚀性环境中提高低频吸收性能.
- 为低频和高频应用创造高性能BPC微波吸收器.
主要方法:
- 合成了来自玉米谷的碳材料.
- 通过受控的热处理来设计 (N) 度,以改变吸收频率.
- 通过使用KOH来激活多孔结构以增强低频吸收.
- 评估了微波吸收性能,包括反射损失 (RL) 和有效吸收带宽 (EAB).
主要成果:
- 工程成功地将吸收从Ku频段 (12-18 GHz) 转移到C频段 (4-8 GHz).
- 优化的BPC在7.84GHz (C频段) 实现了53.92dB的最小反射损失 (RLmin),在2.0毫米厚度的6.56GHz的超宽有效吸收带宽 (EABmax).
- 一个单独的高频吸收器在15.84GHz (Ku频段) 显示RLmin为-47.31dB,在3.0毫米厚度下EBmax为8.08GHz.
- 该材料在潮湿和腐蚀条件下表现出卓越的性能.
结论:
- 在BPC中工程度度是调整微波吸收频率的有效方法.
- KOH激活显著提高了低频吸收能力.
- 这项研究为制造各种频率应用的高性能BPC微波吸收器提供了一种多功能方法.
- 开发的材料为先进的雷达和5G技术提供了有前途的解决方案.
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