Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Synthesis of Highly Reliable Conductive Pastes with Silver-Graphene Composites

  • Sangmin Lee (Department of Chemical & Biomolecular Engineering, Seoul National University of Science and Technology) ;
  • Kye Sang Yoo (Department of Chemical & Biomolecular Engineering, Seoul National University of Science and Technology)
  • Received : 2024.10.14
  • Accepted : 2024.11.11
  • Published : 2024.12.10
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Abstract

This study focuses on the synthesis and optimization of Ag-graphene composite particles and their incorporation into conductive pastes for electronic applications. The composites were synthesized by mixing organic solvents to facilitate graphene formation on silver particle surfaces, followed by ultrasonic irradiation. Main parameters, including solvent ratio and ultrasonic power, were adjusted to optimize the carbon matrix, targeting a thickness of less than 2 nm for effective dispersion in paste formulations. The optimal synthesis conditions were identified as 100 ℃ for 2 hours, using 80% ethanol and 1500 W ultrasonic power. For binder preparation, an epoxy resin was designed with specific curing agents, solvents, and additives to achieve stable room-temperature curing and minimal viscosity fluctuations. The final binder formulation (epoxy, curing agent, solvent, dispersant, and thixotropic agent in a 60:2:30:5:3 ratio) provided excellent stability and dispersion properties. The conductive paste was then produced by combining the optimized Ag-graphene particles with the epoxy binder using a three-roll dispersion process. By varying the particle-to-binder ratio, the 80:20 ratio was found to offer the best balance of shear strength and low resistivity. The paste showed stable viscosity over time, ensuring reliable printability, and scanning electron microscopy (SEM) confirmed strong particle connections, supporting its expected conductivity.

Keywords

Acknowledgement

This study was supported by the Research Program funded by the SeoulTech(Seoul National University of Science and Technology)

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