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Photograph of Showa Denko, a transparent conductive pattern.
Showa Denko and Microwave Chemistry jointly developed a "silver nanowire ink" mass production technology that uses a printing technology to form transparent conductive patterns. According to Showa Denko, samples will be available starting in July 2015.
In 2012, Showa Denko cooperated with Prof. Kazuo Tadashi of Osaka University at the National University of Japan to develop a silver nanowire ink that was printed with a transparent conductive pattern. However, silver nanowire inks need to increase the length-to-diameter ratio (length-to-diameter ratio) of silver nanowires in order to achieve high light transmittance and conductivity. However, silver nanoparticles can be easily synthesized using the original synthesis method. Crystal growth on the entire surface is not easy to form lines, and mass production techniques for establishing stable production have become a major issue.
This time, Showa Denko and Microwave Chemistry have developed a synthesis method using microwave heating, which is one of the selective heating technologies. During the growth of the silver nanowires, when the silver nanoparticles are irradiated with microwaves, only the end of the growth absorbs energy to generate heat. By utilizing this feature, slender nanowires can be efficiently produced by selectively adsorbing a capping agent that inhibits crystal growth on silver nanoparticles.
In addition, silver nanowire inks provide electrical conductivity through photonic curing after printing. This time, Showa Denko has developed a substrate that improves adhesion to substrates and minimizes damage to the substrate during curing. Coating agent. We are also developing an overcoating agent that prevents deterioration of silver nanowires that are generally thermally unstable. Showa Denko will begin providing samples of such inks and peripheral components in July 2015. Showa Denko said: "The mass production plant is not yet set, but production will begin as early as 2016."
In addition, Showa Denko will exhibit a touch sensor and a 7-inch touch panel prototyped using this ink and peripheral components at "JPCA Show 2015" held at Tokyo Ariake International Convention and Exhibition Center on June 3-5, 2015. (Reporter: Yutaro Kojima)
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