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结构设计对基于冷凝的EMI屏蔽的性能起着至关重要的作用:实验性审查

Sara Rostami¹, Ahmadreza Ghaffarkhah^1,2, Seyyed Alireza Hashemi¹

¹Nanomaterials and Polymer Nanocomposites Laboratory, School of Engineering, University of British Columbia, Kelowna, BC, V1V 1V7, Canada. mohammad.arjmand@ubc.ca.

Nanoscale horizons

|October 10, 2024

概括

研究人员开发了基于氧化石墨烯 (GO) 的冷凝,用于电磁干扰 (EMI) 屏蔽. 不同的结构显示出不同的屏蔽机制,有多孔的类似虫的冷凝在吸收而不是反射方面表现出色.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
电磁学电磁学电磁学电磁学

背景情况:

电磁干扰 (EMI) 屏蔽材料在平衡电磁波 (EMW) 的吸收和反射方面经常面临挑战.
非常多孔的结构,如冷凝,需要精心设计电导率和内部多孔性,以实现有效的EMI屏蔽.
石墨烯氧化物 (GO) 是开发先进屏蔽解决方案的有希望的材料.

研究的目的:

制造和描述各种基于氧化石墨烯 (GO) 的冷凝,用于电磁干扰 (EMI) 屏蔽应用.
研究冷凝结构,电导率,多孔性和EMI屏蔽机制 (吸收与反射) 之间的关系.
在多孔材料中建立优化EMI屏蔽效率 (SE_T) 的设计原则.

主要方法:

使用各种方法制造基于GO的冷凝:成型,乳液模板,化学诱导的凝,冷造和液体中的液体流.
制冷凝的热,以提高电导率.
评估物理化学,机械,结构性质和EMI屏蔽性能 (反射率,吸收率,SE_T).

主要成果:

冰凝表现出明显的EMI屏蔽行为,主要机制和整体屏蔽有效性各不相同 (SE_T).
化学交叉连接的冷凝,具有高导电性,主要反射电磁波 (约. 70%的反射率,SE_T=43.2dB) 的情况.
类似虫的冷凝显示出吸收主导的屏蔽 (54.7%的吸收率,SE_T=42.9dB) 由于多尺度的多孔性和接口.

结论:

结构设计显著影响EMI屏蔽机制和基于GO的冷凝的有效性.
类似虫的冷凝为吸收主导的EMI屏蔽提供了一个有希望的途径.
该研究提供了基于多孔结构的先进EMI屏蔽材料设计的启发性规则.

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