Abstract:
A composition may have metal nanoparticles having a diameter of 20 nanometers or less and have a fusion temperature of less than about 220 0C. A method of fabricating the metal nanoparticles may include preparing a solvent, adding a precursor with a metal to the solvent, adding a first surfactant, mixing in a reducing agent, and adding in a second surfactant to stop nanoparticle formation. Copper and/or aluminum nanoparticle compositions formed may be used for lead-free soldering of electronic components to circuit boards. A composition may include nanoparticles, which may have a copper nanocore, an amorphous aluminum shell and an organic surfactant coating. A composition may have copper or aluminum nanoparticles. About 30-50% of the copper or aluminum nanoparticles may have a diameter of 20 nanometers or less, and the remaining 70-50% of the copper or aluminum nanoparticles may have a diameter greater than 20 nanometers.
Abstract:
Functional composite materials comprise elemental inorganic particles within an organic matrix. The elemental inorganic materials generally comprise elemental metal, elemental metalloid, alloys thereof, or mixtures thereof. In alternative or additional embodiments, the inorganic particles can comprise a metal oxide, a metalloid oxide, a combination thereof or a mixture thereof. The inorganic particles can have an average primary particle size of no more than abut 250 nm and a secondary particle size in a dispersion when blended with the organic matrix of no more than about 2 microns. The particles can be substantially unagglomerated within the composite. The organic binder can be a functional polymer such as a semiconducting polymer. The inorganic particles can be surface modified, such as with a moiety having an aromatic functional group for desirable interactions with a semiconducting polymer. Appropriate solution based methods can be used for forming the composite from dispersions of the particles. The composites can be processed into products, such as printed electronics devices.
Abstract:
Respective conductive layers each forming an electrode and terminals are formed on the opposite surfaces of first and second substrates (10, 20). When the first and second substrates are bonded to each other with an anisotropic conductive adhesive material held therebetween, a first electrode (12) of the first substrate (10) and a first electrode lead terminal (24) of the second substrate (20) are electrically connected together with a preset interval apart. The anisotropic conductive adhesive material includes, mixed into an adhesive material (36), non-conductive particles, conductive particles (32) having a grain size gamma 1 that allows a persistence to be within a proper range with respect to an upper limit value Gmax of variations in an adhesion setting gap Gp, and conductive particles (34) having a grain sized gamma 2 that allows a persistence to be within a proper range with respect to a lower limit Gmin of variations in an adhesion setting gap Gp, thereby positively ensuring an electrical conduction despite variations in a gap between substrates to be pasted together.
Abstract:
A solder powder, flux and solder paste which have excellent storage stability and reflow characteristics as well as a soldering method, a circuit board, a method for junction of electronic parts and a junction product which are ready for employment of a finer pitch and diversification of parts are provided. Use is made of a solder powder having a content of particles having a size of 20 mu m or less of 30 % or less in terms of the number of particles and having a oxygen content of 500 ppm or less. Or use is made of a flux which is comprised of an organic acid component comprising an organic acid ester and an ester decomposition catalyst, an organic halide, a reducing agent and a pH adjusting agent. Or a solder paste containing the aforementioned flux and solder powder has a water content of 0.5 wt.% or less.
Abstract:
Provided is a metal base circuit board having a new function of a light reflection in addition to the conventional printed circuit board function for mounting electronic parts. The metal base circuit board has a circuit arranged on a metal plate via an insulation layer. A white film is arranged at least one the insulation layer.
Abstract:
Provided is a metal base circuit board having a new function of a light reflection in addition to the conventional printed circuit board function for mounting electronic parts. The metal base circuit board has a circuit arranged on a metal plate via an insulation layer. A white film is arranged at least one the insulation layer.
Abstract:
This conductive paste is such that the printing properties and sintering properties are superior and is formed such that resistance of wiring after sintering is lowered. This conductive paste is characterized by being formed from copper-based metal particles and by an aspect ratio (dmax/dmin), which is defined as the ratio of the maximum diameter (dmax) and minimum diameter (dmin) for the metal particles, being greater than or equal to 1.0 and smaller than 2.2.