Effect of nano-sized silver particles on the resistivity of polymeric conductive adhesives

✍ Scribed by Hsien-Hsuen Lee; Kan-Sen Chou; Zong-Whie Shih

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 433 KB
• Volume: 25
• Category: Article
• ISSN: 0143-7496
• DOI: 10.1016/j.ijadhadh.2004.11.008

✦ Synopsis

In this work, conductive adhesives were made by adding micro-sized silver flakes, mixed-sized silver particles or nano-sized silver colloids to the polyvinyl acetate (PVAc) emulsion. Film resistivity was then measured as a function of silver volume fraction. Our results indicated that the addition of nano-sized silver colloids to micro-sized Ag flakes usually increased its resistivity, probably due to increased contact resistance. Only near the percolation threshold, would the addition of nano-sized silver particles decrease the resistivity by helping to form the conductive path. Films made with only nano-sized silver colloids at the volume fraction of 0.848 showed a rather low resistivity of 1.93 Â 10 À4 O cm. Increase in heating temperature helped to form necks between particles and thus improve the conductivity to some extent.