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Optoelectronics/Displays  

Printable silver nanowire ink targets flexible films

Posted: 05 Oct 2012     Print Version  Bookmark and Share

Keywords:silver  nanowire ink  photonic curing 

Showa Denko (SDK) boasts a printable silver nanowire ink that when used in combination with a photonic curing process, enables highly stable, transparent conductive patterns to be formed on flexible films.

Developed in cooperation with the Osaka University, the silver nanowire ink can produce transparent conductive films with low sheet resistance (electrical resistance measured in thin film with uniform thickness).

Thus, the ink is expected to replace indium tin oxide (ITO) transparent conductive film for touch screen applications. The problem with conventional silver nanowire inks is that the application of a printing process is difficult due to the ink properties and the high temperature annealing and etching processes that are often necessary after coating, making it difficult to use these inks on plastic substrates. However, SDK's formulation is suitable to be cured with NovaCentrix's photonic curing process.

SDK has also developed copper/silver hybrid ink. While silver ink is already used widely, it is expensive and suffers from a substantial degree of migration (movement of metals on the surface of or inside a non-metallic medium, resulting in short circuit). SDK's new hybrid ink is obtained by adding a small amount of silver nanoparticles to copper nanoparticles. When used in combination with the photonic curing process, printed patterns provide a high conductivity similar to that of silver-ink-based patterns despite the high copper content. At the same time, migration is restricted to a low level. The hybrid ink can be used as a low-cost substitute for conventional silver ink and paste.

- Julien Happich
  EE Times





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