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采用溶剂热法合成长30~90μm的纳米银线。以自制的纳米银线和商用微米银片为导电填料制备了环氧树脂基导电胶(ECAs),研究了纳米银含量和固化温度对导电胶电阻率的影响。结果表明,当固化温度为180℃时,随着纳米银含量的增加,体积电阻率先下降而后又增加;随着固化温度的增加,体积电阻率下降。当银粉总填质量分数为65%(微米银片和纳米银线的含量比是55:10)时,导电胶在180和300℃固化的体积电阻率分别为6.5×10~(-4)和1.3×10~(-4)?·cm。分析认为电阻率的下降与纳米银线在300℃出现烧结行为有关。根据纳米银线在树脂基体中的分布、烧结行为和纳米银线与微米银片间的相互作用关系,讨论了纳米银线对导电胶电阻率的影响机制。
The solvothermal method was used to synthesize silver nanowires 30 ~ 90μm in length. Epoxy resin-based conductive adhesives (ECAs) were prepared by using self-made silver nanowires and commercial silver slides as conductive fillers. The effects of nano-silver content and curing temperature on the resistivity of the conductive paste were investigated. The results show that when the curing temperature is 180 ℃, the volume resistivity decreases first and then increases with the increase of nano-silver content. With the increase of curing temperature, the volume resistivity decreases. When the total mass fraction of silver powder is 65% (the content ratio of silver plate to nano silver wire is 55:10), the volume resistivity of conductive rubber cured at 180 ℃ and 300 ℃ are 6.5 × 10 ~ (-4) and 1.3 × 10 ~ (-4) · · cm. The analysis shows that the decrease of resistivity is related to the sintering behavior of nano silver wire at 300 ℃. According to the distribution of silver nanowires in the resin matrix, the sintering behavior and the interaction between silver nanowires and silver nanofibers, the mechanism of the effect of silver nanowires on the resistivity of the conductive paste was discussed.