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Ternary Ag/epoxy adhesive with excellent overall performance.

Yan-Hong Ji1,2, Yu Liu1, Gui-Wen Huang1

  • 1†Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

ACS Applied Materials & Interfaces
|April 4, 2015
PubMed
Summary

Researchers developed high-performance electrically conductive adhesives (ECAs) using a silver hybrid filler. This novel ternary system overcomes the conductivity-strength trade-off, enabling superior performance at lower silver content for advanced applications.

Keywords:
Ag microflakeAg nanosphereAg nanowireelectrically conductive adhesiveternary hybrid

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Electrically conductive adhesives (ECAs) face a trade-off between electrical conductivity (EC) and lap shear strength (LSS) due to filler content.
  • Increasing conductive filler concentration typically enhances EC but reduces LSS in conventional ECAs.

Purpose of the Study:

  • To develop ECAs with excellent overall performance by overcoming the EC-LSS conflict.
  • To investigate the synergistic effects of a ternary hybrid filler system on ECA properties.
  • To achieve high EC and LSS at significantly lower filler content compared to commercial ECAs.

Main Methods:

  • Formulation of ECAs using a ternary hybrid of silver microflakes (Ag-MFs), silver nanospheres (Ag-NSs), and silver nanowires (Ag-NWs).
  • Systematic study of the effects of relative filler contents on EC and LSS in an epoxy-based adhesive system.
  • Characterization of the developed ECAs and comparison with commercial silver-flake-filled ECAs.

Main Results:

  • A ternary hybrid system of Ag-MFs, Ag-NSs, and Ag-NWs significantly enhances EC even at low silver content.
  • Ag-NSs and Ag-NWs exhibit a synergistic effect in improving EC when combined with Ag-MFs.
  • Optimal Ag filler content yields a synergistic improvement in both EC and LSS.
  • The developed ternary hybrid ECA (40 wt% Ag) surpasses commercial ECAs (over 60 wt% Ag-MF) in both EC and LSS.

Conclusions:

  • The ternary hybrid filler system effectively resolves the EC-LSS conflict in ECAs.
  • The developed ECA demonstrates superior performance and efficiency at reduced filler loading.
  • This advanced ECA formulation shows significant promise for applications like printed radio frequency identification tag antennas.