Ag NWs/PVA复合材料的非线性导电特性
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摘要
为研究聚合物基导电粒子填充型复合材料的非线性导电行为,在制备较高长径比银纳米线(Ag NWs)的基础上,采用Ag NWs与聚乙烯醇(PVA)物理共混并流延成膜,制备得到了Ag NWs/PVA复合薄膜材料,系统测试并分析了其非线性导电开关特性。实验结果表明:在电场作用下,Ag NWs/PVA复合材料表现出优异的非线性导电特性,其电导率可发生约6个数量级的跃变,最大非线性系数可达447.67;在获得材料显著非线性导电和开关特性的同时,实现了3.5～17 kV/m之间阈值场强的可调控能力。
In order to investigate nonlinear conductive behaviors of the polymer composites filled with conductive particles, the silver nanowires(Ag NWs)/polyvinyl alcohol(PVA) composite thin-film materials were prepared by blending and casting of AgNWs with a high aspect ratio and PVA, and their nonlinear conductive switching characteristics were tested and analyzed systematically. The experimental results show that the AgNWs/PVA composites exhibit excellent nonlinear conductivity characteristics under the applied electric field, the conductivity of composites increase up to 6 orders of magnitude, and the maximum nonlinear coefficient can be up to 447.67. At the same time, the ability of adjustment and control about the threshold electric field intensity of composites can be realized between 3.5 kV/m and 17 kV/m.
In order to investigate nonlinear conductive behaviors of the polymer composites filled with conductive particles, the silver nanowires(Ag NWs)/polyvinyl alcohol(PVA) composite thin-film materials were prepared by blending and casting of AgNWs with a high aspect ratio and PVA, and their nonlinear conductive switching characteristics were tested and analyzed systematically. The experimental results show that the AgNWs/PVA composites exhibit excellent nonlinear conductivity characteristics under the applied electric field, the conductivity of composites increase up to 6 orders of magnitude, and the maximum nonlinear coefficient can be up to 447.67. At the same time, the ability of adjustment and control about the threshold electric field intensity of composites can be realized between 3.5 kV/m and 17 kV/m.
引文
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[2]PANDE S,CHAUDHARY A,PATEL D,et al.Mechanical and electrical properties of multiwall carbon nanotube/polycarbonate composites for electrostatic discharge and electromagnetic interference shielding applications[J].RSC Advances,2014,4(27):13839-13849.
[3]刘晨阳,郑晓泉,彭平.无机微米填料改性聚酰亚胺复合材料非线性电导特性[J].高电压技术,2015,41(12):4137-4143.LIU Chenyang,ZHENG Xiaoquan,PENG Ping.Nonlinear conductivity characteristics of modified polyimide composite materials with inorganic filler[J].High Voltage Engineering,2015,41(12):4137-4143.
[4]何金良,谢竟成,胡军.改善不均匀电场的非线性复合材料研究进展[J].高电压技术,2014,40(3):637-647.HE Jinliang,XIE Jingcheng,HU Jun.Progress of nonlinear polymer composites for improving nonuniform electrical fields[J].High Voltage Engineering,2014,40(3):637-647.
[5]李禾,王闯,刘丽岚,等.低填料比石墨烯/环氧树脂复合材料非线性电导机理的实验研究[J].高电压技术,2018,44(3):812-820.LI He,WANG Chuang,LIU Lilan,et al.Experimental study on nonlinear conduction mechanism of epoxy-based nanocomposite with low content of graphene filler[J].High Voltage Engineering,2018,44(3):812-820.
[6]WANG Z,NELSON J K,HILLBORG H,et al.Graphene oxide filled nanocomposite with novel electrical and dielectric properties[J].Advanced Materials,2012,24(23):3134-3137.
[7]WHITE S I,VORA P M,KIKKAWA J M,et al.Resistive switching in bulk silver nanowire-polystyrene composites[J].Advanced Functional Materials,2011,21(2):233-240.
[8]ZHENG X J,JIANG Z Y,XIE Z X,et al.Growth of silver nanowires by an unconventional electrodeposition without template[J].Electrochemistry Communications,2007,9(4):629-632.
[9]CHEN D,QIAO X,QIU X,et al.Large-scale synthesis of silver nanowires via a solvothermal method[J].Journal of Materials Science:Materials in Electronics,2011,22(1):6-13.
[10]STORHOFF J J,MIRKIN C A.Programmed materials synthesis with DNA[J].Chemical Reviews,1999,99(7):1849-1862.
[11]SATOUNGAR M T,AZIZI H,FATTAHI S,et al.Effect of different mediated agents on morphology and crystallinity of synthesized silver nanowires prepared by polyol process[J].Journal of Nanomaterials,2016,2016:1-8.
[12]JI Z G,HUANG D,XI J H,et al.Ultra-low-threshold varistors based on columnar ZnO thin films[J].Journal of Materials Science&Engineering,2009,27(1):9-11.
[13]谢竟成,胡军,何金良,等.压敏陶瓷-硅橡胶复合材料的非线性压敏介电特性[J].高电压技术,2015,41(2):446-452.XIE Jingcheng,HU Jun,HE Jinliang,et al.Nonlinear dielectric and conductivity properties of Zn O varistor/silicon rubber polymer composites[J].High Voltage Engineering,2015,41(2):446-452.
[14]熊瑛,文岐业,田伟,等.硅基二氧化钒相变薄膜电学特性研究[J].物理学报,2015,64(1):1-5.XIONG Ying,WEN Qiye,TIAN Wei,et al.Researches on the electrical properties of vanadium oxide thin films on Si substrates[J].Acta Physica Sinica,2015,64(1):1-5.
[15]QIU D H,WEN Q Y,YANG Q H,et al.Growth of vanadium dioxide thin films on Pt metal film and the electrically-driven metal-insulator transition characteristics of them[J].Acta Physica Sinica,2013,62(21):217201.
[16]李昂,王庆国,王腾,等.强电场条件下二氧化钒薄膜的相变特性研究[J].兵器材料科学与工程,2016,39(6):52-55.LI Ang,WANG Qingguo,WANG Teng,et al.Phase transition of vanadium dioxide thin film under strong electric field[J].Ordnance Material Science and Engineering,2016,39(6):52-55.