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Effect of Ag particle size on electrical conductivity of isotropically conductive adhesives

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4 Author(s)
Lilei Ye ; Dept. of Exp. Phys., Chalmers Univ. of Technol., Goteborg, Sweden ; Zonghe Lai ; Johan Liu ; Tholen, A.

The present work is to introduce nanoparticles in micro-sized metal particles to study particle distribution in polymer matrix. Previous examinations of the silver-filled particles reveal that the micro-sized particle fillers appear as full density silver flakes, while nanoparticle fillers appear as highly porous agglomerates, similar to open-cell foams. Actually little work has been carried out to study the cross-sectional area of a particle-particle-contact in isotropically conductive adhesives (ICA). In this study, transmission electron microscope is chosen as a main measure to analyze the distribution of different-sized particles. The percentage of the nanoparticles varies from 20 wt% and 50 wt% to full percentage within micro-sized particles, and the total metal content in epoxy resin is 70 wt%. So the change of contact area and contact behavior with various volume ratio of nano-sized and micro-sized particles was investigated. At the same time, the electrical resistivity was measured, which is compared with the different level of the filler loading

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Electronics Packaging Manufacturing, IEEE Transactions on  (Volume:22 ,  Issue: 4 )