Application of Novel Dopamine-Polypyrrole Nanofibers for Electrically Conductive Adhesives
Authors: Wei Zhang, Behnam Meschi Amoli, Jeffrey d’Eon, Boxin Zhao, and Alex Chen Company: University of Waterloo and Celestica Inc. Date Published: 9/1/2015
Abstract: Electrically conductive adhesives (ECAs) offer many advantages such as lower processing temperature, simpler processing steps and finer-pitch interconnection in comparison with the traditional soldering technology. However, due to the poor metallurgical connections of silver flakes in the ECA network, it requires a large amount of silver or other metallic fillers to achieve high conductivity, which is not cost-effective for industrial applications. In this work, we present the utilization of a novel type of dopamine-functionalized polypyrrole (DA-PPy) nanofibers to develop a hybrid nanocomposite adhesive with lower metallic contents. Compared to conventional ECAs, the hybrid ECAs displayed significantly higher electrical conductivity. In particular, the introduction of 3 wt% nanofibers into a conventional ECA with 57.9 wt% silver flakes resulted in a significant electrical conductivity enhancement from 110 S/cm to 2400 S/cm, which was comparable to that of ECA filled with 80 wt% silver flakes.