MXene/MWCNTs协同改进聚乳酸非织造布的电磁屏蔽效能

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关键词聚乳酸非织造布；过渡金属碳/氮化物；多壁碳纳米管；电磁屏蔽 中图分类号：TS101.3；TB383.2 文献标志码：A DOI：10.13338/j.issn.1006-8341.2025.04.005

Abstract Aimed to develop lightweight， flexible，and biodegradable electromagnetic shielding materials，a hierarchical spray-coating technique was employed to fabricate MXene/multiwalled carbon nanotubes （MWCNTs）/polylactic acid （PLA） nonwoven composites. After substrate pretreatment，MWCNTs dispersion and MXene （ Ti3C2Tx ） dispersion were sequentially sprayed to regulate the conductive network structure through coating cycles. The results show that MWCNTs formed a primary conductive layer on fiber surfaces，while MXene nanosheets constructed a secondary conductive network via electrostatic self-assembly， forming a multi-scale heterostructure while maintaining the material's porosity and flexibility. When MXene coating reached 5 cycles，the composite achieved an average shielding effectiveness of 46.8dB in the X-band （8.2～12.4GHz） ， significantly surpassing pure PLA nonwoven fabric. Mechanism analysis confirmed that the composite primarily atenuated electromagnetic waves through reflection while simultaneously exhibitingabsorption effects.

Keywordspolylactic acid nonwoven; MXene; multi-walled carbon nanotubes; electromagnetic interference shielding

0 引言

随着现代科技的飞速发展以及物联网和5G技术的普及，电子设备和无线通信技术在日常生活中的应用日益广泛。（剩余12616字）