A comprehensive study of silver nanowires filled electrically conductive adhesives

Abstract

As one of the most important conductive materials, silver nanowires have recently attracted a lot of attention for potential applications such as electrically conductive adhesives, transparent electrodes, and conductive ink. In this paper, silver nanowires with a diameter of 200-570 nm and a length of 20-100 lm were synthesized by a polyol process. The electrically conductive adhesives (ECAs) composed of an epoxy-based binder containing silver nanowire were prepared and the curing behaviors and electrical properties of ECAs were investigated. The in situ monitoring of the variation in electrical resistance of the ECAs explore that silver nanowires impact on the curing behavior of the ECAs. The resistance of the ECAs filled with 40 wt% silver nanowires reaches to 0.59 X heated to 11 min from the room temperature to 164°C. Silver nanowires significantly improve the electrical conductivity of the ECAs, and the resistivities of the ECAs filled with 35 and 40 wt% silver nanowires is 9.48 9 10 -4 and 1.42 9 10 -4 X cm after cured at 168°C, respectively. The reasons for the effects of silver nanowires on the curing behavior and the electrical properties were also discussed in terms of the morphology and higher activity of silver nanowires.

A Novel Seedless TSV Process Based on Room Temperature Curing Silver Nanowires ECAs for MEMS Packaging

“…The resistance of the ECAs filled with 20 wt% silver nanowires continued decreasing to 3 kΩ at 5 h and had little change from 5 to 7 h, signifying that the effective conductive networks had been established when curing proceeded to 5 h. According to Figure 3c, we could similarly deduce that for ECAs filled with 30 and 40 wt% silver nanowires, the effective conductive networks were established when curing proceeded to 3 and 1 h, and the corresponding resistance was 1.7 and 0.2 Ω, respectively. As such, it can be presumed that the higher silver nanowires contents are, the more conductive paths are formed in a shorter curing time, which is consistent with the literature [33,34].…”

“…After confirming that the as-prepared ECAs were fully cured at room temperature, we calculated the resistivity to evaluate the conductivity by the Equation (1) depicted in Section 2.3. The resistivity of the ECAs filled with 30 and 40 wt% silver nanowires was 4.8 × 10 −3 and 6.0 × 10 −4 Ω·cm, respectively, which was comparable to that of other reported high-quality ECAs [33,34]. Note that, unlike the previously reported ECAs composed of epoxy resin, curing agent, curing catalyst, etc., the ECAs prepared herein combined the benefits of both PMMA and silver nanowires.…”

“…Silver nanowires, as one of the most important conductive materials, have attracted extensive attention for many applications, one of which is as a conductive filler in ECAs [32,33,34,35,36]. It is reported that silver nanowires are able to provide ECAs with similar conductivity to traditional Ag flakes at much lower filler loading, meaning they can more easily form a continuous network.…”

Self-Assembly Synthesis of Silver Nanowires/Graphene Nanocomposite and Its Effects on the Performance of Electrically Conductive Adhesive

“…The impact of single silver nanowires and the complex packing of silver nanowires and nanoparticles on the electrical conductivity of ECAs was reported by Chen et al [ 24 ]. Wang et al utilized the Ag nanowires (with a diameter of about 200–570 nm and a length of about 20–100 μm) and concluded that the conductivity of epoxy resin ECAs was evidently improved [ 25 ]. In 2016, Ma et al also concluded that the conductivity of ECAs is efficiently improved with silver nanowires‒nanoparticles composite prepared using the hydrothermal method [ 26 ].…”

Silver Nanowires Inks for Flexible Circuit on Photographic Paper Substrate

“…However, the preparation of AgNWs with a controllable structure has always been a difficult problem. In the past few years, we have been working on investigating the controllable structure, performance and applications of AgNWs [10,11,21,22,23,24,25]. Bergin and coworkers have recently reported that the transmittance of AgNW film with AgNWs of a given diameter linearly rely on area coverage and do not rely on the length of AgNWs, and that the decrease of AgNWs diameter improves optoelectronic performance only for AgNWs with less than 20 nm in diameter [26].…”