Hybrids of silver nanowires and silica nanoparticles as morphology controlled conductive filler applied in flexible conductive nanocomposites
Hybrids of silver nanowires and silica nanoparticles as morphology controlled conductive filler applied in flexible conductive nanocomposites
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DOI：
10.1016/j.compositesa.2015.03.003
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发表时间：
2015-06
影响因子：
8.7
通讯作者：
Yong Wei;Shilong Chen;Fucheng Li;Konghua Liu;Lan Liu
中科院分区：
文献类型：
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作者：
Yong Wei;Shilong Chen;Fucheng Li;Konghua Liu;Lan Liu
基于银纳米线（AgNW）的柔性导电聚合物纳米复合材料已被广泛研究，以开发下一代柔性电子产品。然而，AgNW 倾向于聚集在聚合物基质中，这通常会导致高渗滤阈值。在本研究中，非导电二氧化硅纳米粒子（纳米SiO2）成功地在AgNW上共组装形成AgNW/纳米SiO2杂化物，并制备了填充该杂化物的水性聚氨酯（WPU）导电纳米复合材料。结果表明，由于AgNWs在纳米SiO2的帮助下在WPU中分布更加均匀，填充AgNWs/纳米SiO2杂化物的WPU纳米复合材料的电阻率降低了约5000倍，渗流阈值从10.6vol%降低到3.6vol%。对AgNWs与纳米SiO2相互作用机理的进一步研究表明，促进分散的原因是氢键和范德华力。嵌入AgNWs/纳米SiO2杂化物的WPU纳米复合材料具有优异的机械粘合性、柔韧性和热稳定性。
Flexible conductive polymer nanocomposites based on silver nanowires (AgNWs) have been widely studied to develop the next generation of flexible electronics. However, AgNWs tend to aggregate in polymer matrix that usually results in high percolation threshold. In this study, nonconductive silica nanoparticles (nano-SiO2) were successfully co-assembled on AgNWs to form AgNWs/nano-SiO2hybrids and waterborne polyurethane (WPU) conductive nanocomposites filled with the hybrids were prepared. The results show that the resistivity of WPU nanocomposites filled with AgNWs/nano-SiO2hybrids decreased about 5000 times and the percolation threshold decreased from 10.6 vol% to 3.6 vol% due to AgNWs distribute more uniformly in WPU with the help of nano-SiO2. The further study to mechanism of interactions between AgNWs and nano-SiO2suggest that the promotion of dispersion is attributed to hydrogen bonding and van der Waals force. The WPU nanocomposites embedded with AgNWs/nano-SiO2hybrids present excellent mechanical adhesiveness, flexibility and thermal stability.