期刊
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
卷 25, 期 5, 页码 437-441出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijadhadh.2004.11.008
关键词
nano-sized silver colloid; micro-sized silver flake; conductive adhesive
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 resistivitv 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 x 10(-4) Omega cm. Increase in heating temperature helped to form necks between particles and thus improve the conductivity to some extent. (C) 2005 Published by Elsevier Ltd.
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