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New Bimetallic Alloy Nanoparticles For Printed Electronic Circuits

6.1.2016
Reading Time: 2 mins read
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source: ECN article

Tue, 01/05/2016 – 11:56am by Toyohashi University of Technology

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A Toyohashi Tech researcher, in cooperation with researchers at Duke University, has invented a production method for oxidation-resistant copper alloy nanoparticles for printed electronics. These novel nanoparticles were produced by an environmentally friendly and economical ‘wire explosion’ method. This invention will expand the application range of printed electronics.

“Printed electronics” has the potential to enable low-cost fabrication of electronics on flexible or curved surfaces, which will lead to the use of electronics in more varied applications. We will be able to fabricate homemade mobile phones or smart watches using a printer in the future. However, the low performance and high cost of current conductive inks limit the advancement of printed electronics.

Now, researchers at Toyohashi Tech and Duke University have found a way to produce new copper alloy nanoparticles, which can be used as the main component of affordable conductive inks with high oxidation resistance. The researchers electrically exploded alloy or twisted metal wires in water with a mild reducing agent (Vitamin C) in order to produce the nanoparticles. The reduction in conductivity was subsequently measured under harsh conditions (high temperature and high humidity).

“We have been working on developing a ‘wire explosion’ method to produce novel metal nanoparticles. Then, we found that some of the produced copper alloy nanoparticles possessed both high oxidation resistance and low electrical resistance,” explains Assistant Professor Go Kawamura. “Moreover, the nanoparticles have the advantage of being inexpensive because the production process is very economical and environmentally friendly.”

As a result, copper nanoparticles alloyed with 1% Sn, 5% Ag, 5% Ni, or 30% Ni had electrical conductivities similar to that of copper; however, unlike copper, the nanoparticles remained conductive after 24 h at 85 °C and 85% relative humidity. With further improvement of the electrical conductivity and oxidation resistance, copper alloy nanoparticles prepared by wire explosion could be used for the production of high-performance affordable conductive inks, which will contribute to the advancement of printed electronics. The researchers also hope this work motivates additional study of combining wire explosion with chemical modification of the explosion medium to control the composition and surface chemistry of nanoparticles.

featured picture: These are bright-field (BF) scanning transmission electron microscope images, composed (Compo) elemental mappings, and illustrations of Cu alloy nanoparticles containing 30 percent Ni before and after oxidation treatment at 85 °C and 85 percent relative humidity. Credit: COPYRIGHT (C) 2016 Toyohashi University Of Technology.

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