Patent ID: 8497022

Claim:
A composite nanometal paste, characterized in that said composite nanometal paste consists of, as metal components, a composite metal nanoparticle on which an organic coating layer is formed at a circumference of a metal core with an average particle diameter of X (nm), a metal nanofiller particle with an average particle diameter of d (nm) that is a composite metal nanofiller particle on which an organic coating layer is formed at a circumference of a metal core, and a metal filler particle with an average particle diameter of D (nm); it has a first relation of X<d<D and a second relation of X<d<100 (nm); wherein said average particle diameter d of said metal nanofiller particle has a size so that said metal nanofiller particle is inserted inside a three pocket formed when three said metal filler particles are placed on a plane in a mutually contacting condition; wherein said average particle diameter X of a metal core of said composite metal nanoparticle has a size so that said metal core of said composite metal nanoparticle is inserted inside a gap of said metal filler particles and said metal nanofiller particle in said three pocket; and said composite metal nanoparticle, said metal nanofiller particle, and said metal filler particle sinter compactly when a metal layer is formed by volatilization of said organic coating layer of said composite metal nanoparticle and said organic coating layer of said metal nanofiller particle by firing.