COMPOSITE SILVER NANOPASTE, PROCESS FOR PRODUCING THE COMPOSITE SILVER NANOPASTE, AND METHOD FOR BONDING THE NANOPASTE

摘要

This invention provides a technique for pasting composite silver nanoparticles of C10 or C12 in such a state that is not aggregated, that is, a nonaggregative paste. The composite silver nanopaste is characterized in that composite silver nanoparticles comprising an organic covering layer, formed of at least one of alcohol molecule residues having 10 or 12 carbon atoms, alcohol molecule derivatives and/or alcohol molecules, provided around silver nuclei formed of aggregates of silver atoms, fine particles of silver, and a resin are homogeneously mixed together to constitute the composite silver nanopaste, and the resin can hold the composite silver nanoparticles and the fine particles of silver in a homogeneously dispersed state in a solid or highly viscous nonfluid state at 30ºC or below while, upon heating, the resin becomes flowable and coatable. Preferably, the average particle diameter of the silver nuclei is 1 to 20 nm, the average particle diameter of the fine particles of silver is 0.1 to 3.0 µm, the weight of the composite silver nanoparticles is 5 to 30 (wt%), the weight of the fine particles of silver is 60 to 90 (wt%), and the weight of the resin is not more than 15 (wt%).