The Studies on Surface Treatment of Silver Flakes for Application in Electrically Conductive Adhesives

Silver flakes are widely used as electrically conductive adhesive(ECA) fillers due to the good formation of conductive channels through the line contacts or surface contacts between flakes.The different surface treatments of silver flake for ECA can affect the conductive property and the bonding strength of ECA and the results showed that the dicarboxylic acids can increase the conductivity of ECA significantly.When the surface of silver flakes were modified by pentanedioic acid,the resistivity and the bonding strength of the ECA in a filler loading of 80% can reach 4.0×10-5 Ω·cm and 4.2×106Pa,respectively.About 1.4% pentanedioic acid was adsorbed on silver surface by chemiadsorption.