银纳米线(AgNWs)有着优异的导电性、可弯曲性和较大的长径比等性能,广泛应用在柔性电子器件领域.然而,银纳米线之间高的接触电阻和在基体中较差的分散性会极大地降低其导电网络地电导率.首先通过多元醇法成功合成了AgNWs,其平均长度为 79.44 μm,平均直径为 102.29 nm.然后利用S跟Ag之间地强配位作用,采用含有-SH和-OH的改性剂对AgNWs表面进行改性,研究其在水凝胶中的分散性以及对水凝胶电导率的贡献.研究结果表明,采用硫代甘油(MPD)改性剂对AgNWs改性的效果最佳.当MPD的乙醇分散液(5 mM)与AgNWs的乙醇分散液(2 mg/mL)体积比为 1∶1 时,改性剂在AgNWs表面分布相对均匀,没有出现大面积的团聚现象.将改性的AgNWs加入到聚乙烯醇(PVA)/硼砂水凝胶中,当添加量为 0.04%时,水凝胶电导率为0.858 S/m,相比于未改性AgNWs的PVA/硼砂水凝胶电导率提高了 94%.
Silver nanowires(AgNWs)are widely used in flexible electronic devices due to their excellent conductivity,bendability and large aspect ratio.However,the high contact resistance between silver nanowires and the poor dispersion in the matrix can greatly reduce their conductive network ground conductivity.In this paper,AgNWs with an average length of 79.44 μm and an average diameter of 102.29 nm were successfully synthesized by the polyol method,and then the surface of AgNWs was modified with modifiers containing-SH and-OH by taking advantage of the strong coordination between S and Ag to study their dispersion in hydrogels and their contribution to the conductivity of hydrogels.The results showed that the modification of AgNWs by thioglycerol(MPD)modifier was the most effective.When the volume ratio of ethanol dispersion of MPD(5 mM)to ethanol dispersion of AgNWs(2 mg/mL)was 1:1,the modifier was relatively uniformly distributed on the surface of AgNWs,and there was no large agglomeration.The modified AgNWs were added to the polyvinyl alcohol(PVA)/borax hydrogel,and the hydrogel conductivity was 0.858 S/m when the addition amount was 0.04%,which was a 94%increase in conductivity compared with that of the PVA/borax hydrogel with unmodified AgNWs.