Silver nano ink / paste
(Picosil)

Features of Picosil

  • low temp sintering
  • smooth flat surface
  • low resistivity
  • high concentration dispersion

Picosil is a conductive ink containing nano-level particles of silver dispersed in solvent. After printing, low-temperature heat treatment (100℃ or above) is used to turn the ink into a low-resistance conductive film.
When printing conditions are optimized, the conductive film can be formed to a high level of smoothness (Ra < 100 nm*).

*This is a typical value and is not guaranteed.

Picosil-compatible Printing Methods

We have developed silver nanoparticle inks and pastes adapted to the characteristics of various printing methods. Inkjet printing and screen printing are two common printing methods, but each method has different characteristics and ink performance requirements. For example, the inkjet printing method allows direct printing on a substrate without the need for a printing plate. However, because the ink must be ejected through a small-diameter nozzle, it must be modified to a very low viscosity of several mPa·s. The screen printing method, on the other hand, involves the use of a printing plate, but it is applicable to a variety of printing substrates and printing can be performed in a short time. With this method, the printing plate is filled with ink for printing, so it is necessary to modify the viscosity to about 100,000 mPa·s so that the ink does not drip or bleed from the plate after it is filled. Clearly, the physical properties (viscosity) required for each printing method differ, so it is important to select an ink of the appropriate viscosity band for the particular application.
Picosil is available in a wide range of viscosities, from low to high, to serve the diverse printing applications and methods used by our customers.

Typical Characteristics of Picosil

Low-viscosity type (DNS-0163I) (Available for mass-production.)

*Production available

Viscosity 8-12 mPa·s
Silver concentration 48-52 wt%
Standard sintering conditions 30 min @ 120℃
Volume resistivity 5-10 µΩ·cm

*This is a typical value and is not guaranteed.

Medium-viscosity type (DNS-0351P)

Shear rate: 1/S = 10 Viscosity 10-20 Pa·s
Silver concentration 60-65 wt%
Standard sintering conditions 30 min @ 120℃
Volume resistivity 5-10 µΩ·cm

*This is a typical value and is not guaranteed.

High-viscosity type (DNS-0409P) (Available for mass-production.)

*Production available

Shear rate: 1/S = 10 Viscosity 90-100 Pa·s
Silver concentration 65-70 wt%
Standard sintering conditions 30 min @ 120℃
Volume resistivity 5-10 µΩ·cm

*This is a typical value and is not guaranteed.

Printing Examples
Inkjet printing(Thickness ~1µm)
Dispenser printing
Screen printing(Thickness ~10µm)
Imprint printing
Gravure offset printing

Silver Nanoparticles

The silver nanoparticles contained in Picosil measure 20-100 nanometers in average particle size and comprise a silver nano core covered with an organic layer.
This organic layer enhances the dispersibility of the particles in the organic solvent and serves to suppress the aggregation of particles, thus maintaining the storage stability of the silver nano-ink.
In addition, this organic layer is formulated to evaporate easily after printing when subjected to low-temperature heat during sintering.

Ink Paste with Silver Nanoparticles

As a combination of silver nanoparticles and solvent, Picosil silver nano-ink paste is available in a wide range of viscosities, from low-viscosity ink for inkjet printing to high-viscosity paste for screen printing.
This product is formulated for various types of printing applications, and conductive patterns can be formed by heating (sintering) the product after printing.

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