电磁干扰、电磁辐射对人类生产生活的影响越来越严重,电磁屏蔽材料因而应运而生。目前的电磁屏蔽材料中,金属纳米线具有较高的电导率和可弯折性能,其中银纳米线因具有化学稳定性好、制备成本较低、成膜后易修复、可大批量生产等优势,成为新一代电磁屏蔽材料。以溴化钠和氯化铁为原料制备银纳米线并将其半嵌入到聚氨酯膜形成屏蔽材料。制备的银纳米线@聚氨酯薄膜无需后期热处理,方块电阻达到10Ω/sq,当薄膜厚度达到5μm时,其电磁屏蔽效能超过40dB。与此同时,制备的半嵌入式结构银纳米线@聚氨酯薄膜具有优良的耐弯折性能(弯折500次方块电阻变化率<0.5,电磁屏蔽效能变化率为3%)和力学稳定性能(粘接200次方块电阻变化率<0.35)。
Electromagnetic interference and radiation have more and more influenced human's production and health,thus the electromagnetic shielding materials came into being.Metal nanowires have high conductivity and bendable properties among the existing electromagnetic shielding materials.Especially,the silver nanowires which have the advantages of good chemical stability,low-cost preparation,convenience in mass production have been the new generation of electromagnetic shielding material.The preparation of silver nanowires used sodium bromide and ferric chloride and semi-embedded structure of the nanowires film forming process were introduced.Sheet resistance of the film can reach 10Ω/sq.When the film thickness reached 5 microns,the electromagnetic shielding efficiency was more than 40dB.The semi-embedded silver nanowire@polyurethane structure had excellent bending resistance (bending 500 times,ΔR/R0<0.5,ΔSE/SE0=3%) and mechanical stability (glue 200 times,ΔR/R0<0.35),which provided an ideal technical solution for the preparation and application of electromagnetic shielding materials.
[1] 邱治文,孙晓刚,庞志鹏,等.稀土氧化物掺杂碳纳米管屏蔽纸[J].化工进展,2018,37(1):236-241.
[2] Chen Y,Li Y,Yip M,et al.Electromagnetic interference shielding efficiency of polyaniline composites filled with graphene decorated with metallic nanoparticles[J].Composites Science and Technology,2013,80:80-86.
[3] Chen S,Cui Q,Guo X.Annealing-free solution-processed silver nanowire-polymer composite transparent electrodes and flexible device applications[J].IEEE Transactions on Nanotechnology,2015,14(1):36-41.
[4] Jiang Y,Xi J,Wu Z,et al.Highly transparent,conductive,flexible resin films embedded with silver nanowires[J].Langmuir,2015,31(17):4950-4957.
[5] Xu L,Li H,Xia J,et al.Graphitic carbon nitride nanosheet supported high loading silver nanoparticle catalysts for the oxygen reduction reaction[J].Materials Letters,2014,128:349-353.
[6] Jing M,Han C,Li M,et al.High performance of carbon nanotubes/silver nanowires-PET hybrid flexible transparent conductive films via facile pressing-transfer technique[J].Nanoscale Research Letters,2014,9(1):1-7.
[7] Peng P,Huang H,Hu A,et al.Functionalization of silver nanowire surfaces with copper oxide for surface-enhanced Raman spectroscopic bio-sensing[J].Journal of Materials Chemistry,2012,22(31):15495-15499.
[8] Mao Y,Wang C,Yang H.Rapid and uniform synthesis of silver nanowires via rice-shaped silver nucleant[J].Materials Letters,2015,142:102-105.
[9] Hu M,Gao J,Dong Y,et al.Flexible transparent PES/silver nanowires/PET sandwich-structured film for high-efficiency electromagnetic interference shielding[J].Langmuir,2012,28(18):7101-7106.
[10] Sun Y,Yin Y,Mayers B T,et al.Uniform silver nanowires synthesis by reducing AgNO3 with ethylene glycol in the presence of seeds and poly (vinyl pyrrolidone)[J].Chemistry of Materials,2002,14(11):4736-4745.
[11] Liang J,Wang Y,Huang Y,et al.Electromagnetic interference shielding of graphene/epoxy composites[J].Carbon,2009,47(3):922-925.
[12] Saini P,Choudhary V.Enhanced electromagnetic interference shielding effectiveness of polyaniline functionalized carbon nanotubes filled polystyrene composites[J].Journal of Nanoparticle Research,2013,15(1):14-15.
[13] Arjmand M,Mahmoodi M,Gelves G A,et al.Electrical and electromagnetic interference shielding properties of flow-induced oriented carbon nanotubes in polycarbonate[J].Carbon,2011,49(11):3430-3440.
[14] Gupta A,Choudhary V.Electromagnetic interference shielding behavior of poly (trimethylene terephthalate)/multi-walled carbon nanotube composites[J].Composites Science and Technology,2011,71(13):1563-1568.
[15] Mahmoodi M,Arjmand M,Sundararaj U,et al.The electrical conductivity and electromagnetic interference shielding of injection molded multi-walled carbon nanotube/polystyrene composites[J].Carbon,2012,50(4):1455-1464.
[16] Yan D X,Ren P G,Pang H,et al.Efficient electromagnetic interference shielding of lightweight graphene/polystyrene composite[J].Journal of Materials Chemistry,2012,22(36):18772-18774.
[17] Gupta T K,Singh B P,Mathur R B,et al.Multi-walled carbon nanotube-graphene-polyaniline multiphase nanocomposite with superior electromagnetic shielding effectiveness[J].Nanoscale,2014,6(2):842-851.
[18] Yuan B,Yu L,Sheng L,et al.Comparison of electromagnetic interference shielding properties between single-wall carbon nanotube and graphene sheet/polyaniline composites[J].Journal of Physics D:Applied Physics,2012,45(23):235108.
[19] Huang C Y,Wu J Y,Tsao K Y,et al.The manufacture and investigation of multi-walled carbon nanotube/polypyrrole/EVA nano-polymeric composites for electromagnetic interference shielding[J].Thin Solid Films,2011,519(15):4765-4773.
基金资助
国家优秀青年学者(51325203);上海市科学技术委员会优秀学术带头人项目(15XD1501700);长江学者项目(T2015136)
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