Ecofriendly Catechol Lipid Bio-Resin for Low-Temperature Processed Electrode Patterns with Strong Durability

ACS Applied Materials & Interfaces
Bora LeeJung Ah Lim

Abstract

We demonstrate catechol lipid-based bio-resin, which is collected from lacquer trees, to produce conductive pastes that can be processed at low temperatures, are highly adhesive and multi-durable. Our conductive paste, which consists of catechol lipid-based urushiol resin and a multimodal mixture of silver fillers, exhibited stable dispersion with shear thinning properties. The urushiol lacquer induced spontaneous reduction of silver salt at the surface of the silver fillers, thereby contributing to lower the contact resistance between conductive fillers in the electrical conduction. Furthermore, the directional volume shrinkage of the urushiol lacquer matrix in a crosslinking reaction resulted in a highly ordered microstructure of the silver fillers with layer-by-layer stacking of the silver flakes. This structure contributed to the improvement of the electrical contact between fillers as well as excellent mechanical hardness, anti-scratch capability, and the long-term environmental stability of the conductive films. Conductive films based on the silver paste with urushiol lacquer exhibited low electrical resistivity below 4.4 × 10-5 Ω cm, 5B-class strong adhesion strength, and high hardness exceeding 200 MPa. Finally, we demo...Continue Reading

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