Synthesis and Application on Conductive ink of G-AMT-Ag Based on Molecular Bridging

Abstract

Graphene/nano-silver inks have become the new favorite in conductive inks, and graphene/nano-silver composites are primarily prepared through physical blending or grafting with oxygen-containing functional groups, which increases interfacial contact resistance and surface structural defects, reducing conductive performance. In this study, molecular bridging technology was adopted to prepare a graphene/nano-silver composites using AMT as the molecular bridging agent. One end of AMT was anchored to the graphene surface via a diazonium reaction, while the other end reacted with silver ions through a thiol group to form a silver-sulfur bond, and a graphene/silver nanoparticle composite named G-AMT-Ag was obtained. The molecular structure and properties of the G-AMT-Ag were systematically characterized through SEM, FTIR, XRD, XPS, and other methods. The effect of the graphene/nano-silver ratio on dispersibility was analyzed, and the optimal molar ratio of graphene/nano-silver was 50/11. G-AMT-Ag conductive ink was screen-printed on PET substrate for conductivity testing, the conductivity was measured at 41,003 S/m, which is 1.9 times that of a G/Ag ink, and the flexibility testing demonstrated excellent performance. This study provides a preparation method of graphene/silver nanoparticle conductive ink with low-cost and high conductivity, demonstrating significant application potential in the field of flexible electronics.