PVDF/MWCNTs-AgNWs@MXene bilayer 3 D networks electromagnetic shielding composite films with highly conductive
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摘要: 随着通信网络、无线设备以及航空航天的快速发展,电磁波危害日益加剧,因而急需电磁屏蔽性能更优异的复合材料。本文采用MXene (Ti3C2Tx)、银纳米线(AgNWs)和多壁碳纳米管(MWCNTs)构建了双层的高导电三维(导电率最高为1.4×104 S·m−1)网络电磁屏蔽复合薄膜(Ti3C2Tx MXene基功能复合薄膜)。特别是采取真空辅助抽滤法(VAF)将10 mL AgNWs以及15 mL Ti3C2Tx MXene的水溶液吸附于聚偏氟乙烯(PVDF)/MWCNTs复合薄膜之上,制备出的Ti3C2Tx MXene基功能复合薄膜的总电磁干扰屏蔽效能(EMI SET)高达69.0 dB,比商用标准(20 dB)高出245%,其中吸收损耗效能(SEA)占比85.1%。说明Ti3C2Tx MXene基功能复合薄膜主要的电磁损耗机制为吸收损耗,比电磁屏蔽效能(SSEt)最高可达2719.8 dB/(cm−2·g)。这项工作为新型MXene材料在电磁屏蔽复合材料中的应用提供了结构设计和研究思路。
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关键词:
- Ti3C2Tx MXene /
- AgNWs /
- 复合薄膜 /
- 电磁屏蔽 /
- 吸收损耗
Abstract: With the development of communication networks, wireless devices and aerospace industries. Electromagnetic wave hazards become prevalent. Therefore, it is essential to develop composites with better electromagnetic shielding properties. In this paper, highly conductive three-dimensional (conductivity up to 1.4×104 S·m−1) networked electromagnetic shielding composite films (Ti3C2Tx MXene-based functional composite films) were constructed using MXene (Ti3C2Tx), silver nanowires (AgNWs) and multi-walled carbon nanotubes (MWCNTs) in a bilayer. In particular, the aqueous solutions of 10 mL AgNWs and 15 mL Ti3C2Tx MXene were adsorbed on top of poly(vinylidene fluoride) (PVDF)/MWCNTs composite films by vacuum-assisted filtration (VAF), and the total electromagnetic interference shielding effectiveness (EMI SET) of the Ti3C2Tx MXene-based functional composite film was as high as 69.0 dB, which was 245% higher than that of the commercial standard (20 dB), of which the absorption loss effectiveness (SEA) accounted for 85.1%. It is shown that the main electromagnetic loss mechanism of Ti3C2Tx MXene-based functional composite films is absorption loss, with a specific electromagnetic shielding effectiveness (SSE/t) of up to 2719.8 dB/(cm−2·g). This work provides structural design and research ideas for the application of novel MXene materials in electromagnetic shielding composites.-
Key words:
- Ti3C2Tx MXene /
- AgNWs /
- composite films /
- electromagnetic shielding /
- absorption loss
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图 2 Ti3C2Tx MXene的SEM图片 (a)和EDS(b)以及Ti3AlC2(刻蚀前)和Ti3C2Tx MXene(刻蚀后)的XRD谱图(c)AgNWs的SEM形貌分析(d)和XRD谱图(e)以及Ti3C2Tx MXene、AgNWs和AgNWs@MXene的FTIR谱图(f)
Figure 2. SEM images of Ti3C2Tx MXene (a) and EDS (b) and XRD spectra of Ti3AlC2 (before etching) and Ti3C2Tx MXene (after etching) (c) SEM morphology analysis (d) and XRD spectra of AgNWs (e) and FTIR spectra ofTi3C2Tx MXene, AgNWs and AgNWs@MXene (f)
图 3 PVDF/MWCNTs-3 wt%-MXene-X双层复合薄膜的形貌表征(a、b、c分别代表M3-MX-0、M3-MX-10、M3-MX-20;1:表观形貌;2:底层局部放大形貌;3:断面形貌;4:抽滤层局部放大形貌)
Figure 3. Morphological characterisation of PVDF/MWCNTs-3 wt%-MXene-X bilayer composite films(a, b, c represent M3-MX-0, M3-MX-10, M3-MX-20, respectively; 1: apparent appearance; 2: local enlargement of the bottom layer; 3: cross-section appearance; 4: local enlargement of the extraction layer)
图 4 PVDF/MWCNTs-3 wt%-AgNWs@MXene-X双层复合薄膜的形貌表征(A、B、C分别代表M3-Ag@MX-0、M3-Ag@MX-10、M3-Ag@MX-20;1:表观形貌;2:底层局部放大形貌;3:断面形貌;4:抽滤层局部放大形貌)
Figure 4. Morphological characterisation of PVDF/MWCNTs-3 wt%/AgNWs@MXene-X bilayer composite films (A, B, C represent M3-Ag@MX-0, M3-Ag@MX-10, M3-Ag@MX-20, respectively; 1: apparent appearance; 2: local enlargement of the bottom layer; 3: cross-section appearance; 4: local enlargement of the extraction layer)
表 1 不同Ti3C2Tx MXene含量的双层复合薄膜的导电性能数据
Table 1. Conductivities of bilayer composite films with different Ti3C2Tx MXene contents
Sample items Thickness/
mmElectrical conductivity/(S·m−1) Conductivity
growth rate/%M3-MX-0 0.57 2.5×100 − M3-MX-5 0.46 5.9×100 57.6 M3-MX-10 0.42 7.9×100 25.3 M3-MX-15 0.39 8.7×100 9.2 M3-MX-20 0.50 7.5×100 −16.0 M3-MX-25 0.44 5.5×100 −36.4 M3-Ag@MX-0 0.51 4.1×103 99.9 M3-Ag@MX-5 0.46 5.1×103 19.6 M3-Ag@MX-10 0.6 8.5×103 40.0 M3-Ag@MX-15 0.47 1.4×104 39.3 M3-Ag@MX-20 0.43 1.3×104 −7.7 M3-Ag@MX-25 0.46 1.2×104 −8.3 表 2 不同Ti3C2Tx MXene含量的双层复合薄膜的电磁屏蔽效能数据
Table 2. Electromagnetic shielding effectiveness data of bilayer composite films with different Ti3C2Tx MXene contents
Sample items SET/dB SER/dB SEA/dB SEA/SER/% SSEtdB/(cm−2·g) M3-MX-0 5.0 0.9 4.0 4.3 87.6 M3-MX-5 6.8 1.5 5.3 3.5 147.5 M3-MX-10 7.2 1.7 5.5 3.2 171.0 M3-MX-15 7.0 1.7 5.3 3.0 180.2 M3-MX-20 6.9 1.8 5.0 2.8 137.1 M3-MX-25 6.9 1.6 5.4 3.5 157.7 M3-Ag@MX-0 60.2 9.5 50.8 4.6 2487.7 M3-Ag@MX-5 60.4 10.7 49.5 5.3 2102.2 M3-Ag@MX-10 61.5 9.5 52.0 5.5 2068.3 M3-Ag@MX-15 69.0 10.3 58.7 5.7 2356.6 M3-Ag@MX-20 68.2 10.3 57.8 5.6 2719.8 M3-Ag@MX-25 67.9 10.0 57.9 5.8 2439.4 Notes: The values of SET (dB), SEA (dB), and SER (dB) in the table are the average values obtained at 8.2-12.4 GHz. SEA/SER is the ratio of absorption loss SEA to reflection loss SER. SSEt denotes the ratio of EMI SE. -
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