We have developed a unique, fully scalable, lower cost, patent pending, aqueous silver nanoparticle synthesis and in situ stabilization process. The particles are formulated into proprietary conductive printing inks with minimal impact on the unique properties of the base particle dispersions.
Silver Nanoparticle Properties
Particle Size: As synthesized particles have a nominal average particle size in the range of 10-30 nm.
Chemistry: The unique stabilization chemistry of PChem's aqueous silver nanoparticle dispersions allows them to cure at lower temperatures (as low as 80 C) and significantly faster rates (as little as 0.5 seconds) than competitive materials.
pH: Typical aqueous dispersions and inks have pH in the range of 5.2-5.5
Concentration: Aqueous silver nanoparticle base dispersions and fully formulated conductive printing inks are available at concentrations from 1 % up to 45 weight % silver.
Rheology: Non-Newtonian, shear thinning rheology. Typical viscosity values of 500-5000 cP @ 10s-1 and 100-200 cP @ 1000s-1.
Stability: Aqueous nanoparticle dispersions and inks are stable for at least 3 months under proper storage conditions.
Low Temperature High Speed Curing: As synthesized base nanoparticles cure very rapidly to shiny silver/white colored electrically continuous films. The SEM below of a film cured at 100°C for seconds shows the low temperature high speed sintering behavior of the nanoparticles.
Resistivity: The resistivity as a function of time at various temperatures is shown in the plots below for two thickness ranges. To better understand how resistance and resistivity is measured see this white paper: Resistance and Resistivity
