Xie H, Xiong N N, Wang Y H, Zhao Y Z, Li J Z
J Nanosci Nanotechnol. 2016 Jan;16(1):1125-37. doi: 10.1166/jnn.2016.10687.
In this paper, two kinds of silver nanowires with a 160 nm average diameter ranging from 30 to 90 µm length and a 450 nm average diameter up to 100 µm length were successfully synthesized by a polyol process with FeCl3 and Na₂S as reaction inhibitor, respectively. The experimental results indicate that the morphologies and sintering behaviors of both of silver nanowires are impacted by glutaric acid and sintering temperature. The isotropically conductive adhesives (ICAs) filled with micro-sized silver flakes and silver nanowires as hybrid fillers were fabricated and the electrical properties were investigated based on the fraction of the silver nanowires of the total of silver fillers and the curing temperature, etc. The in situ monitoring the variation in electrical resistance of the ICAs explores that silver nanowires have influence on the curing behavior of the ICAs. Silver nanowires synthesized with Na2S as reaction inhibitor and treated with glutaric acid can significantly improve the electrical conductivity of the ICAs in the case of the low loading of silver fillers in the appropriate proportion range of the weight ratio of micro-sized silver flakes and silver nanowires, primarily as a result of connecting effect. When the loading of silver fillers in the ICAs is high, the electrical conductivity is also enhanced slightly in the case of the proper fraction of silver nanowires of the total of silver fillers. The effect of the curing temperature on the electrical conductivity relates to the fraction of silver nanowires and the total loading of silver fillers. The electrical conductivity of the ICAs filled with micro-sized silver flakes and silver nanowires synthesized with FeCl₃ as reaction inhibitor is greatly damaged, indicating that the size of silver nanowires also is one of main factor to impact the electrical conductivity of the ICAs doped with silver nanowires. The electrical property of the ICAs filled with micro-sized silver flakes and silver nanowires results mainly from the synergy of silver flakes and nanowires, forming the conductive pathways.
在本文中，分别以FeCl₃和Na₂S作为反应抑制剂，通过多元醇法成功合成了两种平均直径为160 nm、长度范围为30至90 µm以及平均直径为450 nm、长度达100 µm的银纳米线。实验结果表明，戊二酸和烧结温度会影响两种银纳米线的形貌和烧结行为。制备了填充有微米级银片和银纳米线作为混合填料的各向异性导电胶（ICAs），并基于银纳米线在银填料总量中的占比以及固化温度等因素研究了其电学性能。对ICAs电阻变化的原位监测发现，银纳米线对ICAs的固化行为有影响。在微米级银片与银纳米线重量比的适当比例范围内，以Na₂S作为反应抑制剂合成并经戊二酸处理的银纳米线，在银填料负载量较低的情况下，主要由于连接效应，可显著提高ICAs的电导率。当ICAs中银填料的负载量较高时，在银纳米线在银填料总量中占适当比例的情况下，电导率也会略有提高。固化温度对电导率的影响与银纳米线的占比以及银填料的总负载量有关。填充有以FeCl₃作为反应抑制剂合成的微米级银片和银纳米线的ICAs的电导率受到极大损害，这表明银纳米线的尺寸也是影响掺杂银纳米线的ICAs电导率的主要因素之一。填充有微米级银片和银纳米线的ICAs的电学性能主要源于银片和纳米线的协同作用，形成了导电通路。
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