In-situ reduction of silver by surface DBD plasma: a novel method for preparing highly effective electromagnetic interference shielding Ag/PET
In-situ reduction of silver by surface DBD plasma: a novel method for preparing highly effective electromagnetic interference shielding Ag/PET
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表面DBD等离子体原位还原银：制备高效电磁干扰屏蔽Ag/PET的新方法
DOI：
10.1088/2058-6272/abe200
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发表时间：
2021-03
影响因子：
1.7
通讯作者：
Xiuling Zhang
中科院分区：
文献类型：
--
作者：
Zhiyuan Fan;Lanbo Di;Decai Bu;Tengda Zhang;Xiuling Zhang
具有良好柔韧性和耐候性的电磁干扰（EMI）屏蔽复合材料越来越受到人们的关注。在本研究中，我们将亚大气压辉光放电等离子体的表面改性方法与原位大气压表面介质阻挡放电等离子体（APSDBD）还原相结合，制备了聚对苯二甲酸乙二醇酯负载的银（Ag/PET）。由于 PET 薄膜的显着表面改性、温和的等离子体还原以及聚乙烯吡咯烷酮 (PVP) 对银形态的有效控制，超低银含量 (0.022 wt%) 的 3.32 μm 厚银膜在 0.01 GHz 时表现出 39.45 dB 的 EMI 屏蔽效率 (SE)，在 1.0 GHz 时表现出 31.56 dB（在 1.0 GHz 范围内>30 dB）。 0.01–1.0 GHz）。 SEM结果和EMI屏蔽分析表明，其高性能源于银纳米颗粒（AgNPs）形成的协同效应，银纳米颗粒具有优先取向的细胞状表面形貌和内部层层叠加的微结构，表现出很强的微波反射性能。傅里叶变换红外光谱仪和X射线衍射仪表明热敏基材材料的表面结构没有被等离子体破坏。此外，APSDBD技术制备Ag/PET对基材的厚度、介电常数和电导率没有特殊要求，为以相对较低的成本在热敏材料表面制备金属或合金薄膜提供了有效的策略。
Electromagnetic interference (EMI) shielding composites with good flexibility and weatherability properties have attracted increased attention. In this study, we combined the surface modification method of sub-atmospheric pressure glow discharge plasma with in situ atmospheric pressure surface dielectric barrier discharge plasma (APSDBD) reduction to prepare polyethylene terephthalate supported silver (Ag/PET). Due to the prominent surface modification of PET film, mild plasma reduction, and effective control of the silver morphology by polyvinylpyrrolidone (PVP), a 3.32 μm thick silver film with ultralow sliver loading (0.022 wt%) exhibited an EMI shielding efficiency (SE) of 39.45 dB at 0.01 GHz and 31.56 dB at 1.0 GHz (>30 dB in the range of 0.01–1.0 GHz). The SEM results and EMI shielding analysis indicated that the high performance originated from the synergistic effect of the formation of silver nanoparticles (AgNPs) with preferentially oriented cell-like surface morphologies and layer-by-layer-like superimposed microstructures inside, which demonstrated strong microwave reflection properties. Fourier transform infrared spectrometer and x-ray diffractometer showed that the surface structures of the heat-sensitive substrate materials were not destroyed by plasma. Additionally, APSDBD technology for preparing Ag/PET had no special requirements on the thickness, dielectric constant, and conductivity of the substrate, which provides an effective strategy for manufacturing metal or alloy films on surfaces of heat-sensitive materials at a relatively low cost.
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