News from Nanotechjapan


A New Principle Printing Technique based on UV Activated Nanoparticle Chemisorption for Conductive Silver Patterning with Submicron Resolution

 The National Institute of Advanced Industrial Science and Technology (AIST) issued a joint press release on 20th April 2016 with the University of Tokyo, Yamagata University, Tanaka Kikinzoku Kogyo K.K. and Japan Science and Technology Agency (JST). The release announced that a collaborative research group has succeeded in an epoch-making new printing technology which enables production of ultrafine silver wiring only by patterning using ultraviolet irradiation and subsequent surface coating of silver nanometal ink. The results were published in Nature Communications*.

 Silver nanocolloid is an important material for printing-based device production technologies. However, printed conductive patterns of sufficiently high quality and resolution for industrial products have not yet been achieved. The research group has developed a technique which utilizes selective chemisorption of silver nanoparticles in the silver nanometal ink on an activated surface produced by ultraviolet irradiation at wavelength of 172 nm. The chemisorption is followed by the self-fusion reaction between nanoparticles to afford low-resistance silver wiring. This technique enables easy and rapid production of ultrafine silver patterns over a large-area substrate with minimum linewidth of 0.8 μm and strong adherence to plastic substrates without using vacuum.

 A flexible touch-screen sensor produced by this technology is demonstrated by an 8 inch trial product, and sample shipment is planned to begin in January 2017.

*T. Yamada, K. Fukuhara, K. Matsuoka, H. Minemawari, J. Tsutsumi, N. Fukuda, K. Aoshima, S. Arai, Y.Makita, H. Kubo, T. Enomoto, T. Togashi, M. Kurihara, and T. Hasegawa, "Nanoparticle chemisorption printing technique for conductive silver patterning with submicron resolution", Nature Communications, Vol. 7, Article number: 11402 doi: 10.1038/ncomms11402; Published 19 April 2016