Abstract:
Disclosed is a composition for a conductive paste containing micrometer-thick silver microplates (or plate-shaped silver micro particles) surface-modified with metal nano particles. The composition can be sintered at a relatively low temperature between 150 to 300 °C. For this purpose, it needs not more than 65 % silver nano particles per the weight of the composition. The plate-shaped silver micro particles may be replaced with plate-shaped copper micro particles coated with silver. The composition for a conductive paste may comprise solely the metal- modified silver microplates as a conductive material, and further comprise metal nano particles. According to another aspect, the composition may further comprise carbon nanotubes in addition to the metal nano particles. As additional conductive materials, micrometer-size flake-shaped copper and/or silver particles may be further included.
Abstract:
Disclosed is a method for producing a conductive silver ink that has conductivity of a suitable level for a wiring material and uniform dispersion of silver particles, and can be sintered at low temperature. The method ensures excellent dispersion of silver particles by directly dispersing a silver ion complex in an organic solvent prior to reducing the silver ion complex into silver particles. The method includes reacting silver ions with branched chain carboxylic acid having 6 to 14 carbon atoms or its salt to form a silver ion complex; dispersing the silver ion complex in an organic solvent to prepare a silver ion complex-dispersed mixture; and adding a reducing agent to the silver ion complex-dispersed mixture to reduce the silver ions.
Abstract:
Disclosed is an electroconductive silver nanoparticle ink containing an electroconductive silver nanoparticle composition, comprising a dispersion and silver-coated plate-shaped copper flakes and silver nanoparticles put in the dispersion.
Abstract:
Disclosed is a composition for a conductive paste containing micrometer- size plate-shaped metal particles having a thickness of 200 nm or less. The composition comprises silver nano particles having an average particle size between 1 nm to 100 nm; and plate-shaped metal particles. Preferably, the micrometer-size plate-shaped metal particles have an average thickness of 200 nm or less. Preferably, the micrometer- size plate-shaped metal particles have horizontal and vertical sides of 1 to 20 µm size on average. The composition may further comprise metal nano particles such as copper, palladium and so on. And, the composition may further comprise carbon nanotubes, and the surface of the carbon nanotubes may be coated with metal nano particles. The use of such composition can reduce a sintering temperature to a low temperature of 150 °C or lower and decrease the thickness of a circuit wire for achieving the same resistance.