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US researchers use nano-silver wires to develop highly conductive and highly flexible conductive materials
Edit:Shangmeng Technology Wuxi Co., Ltd.   UpDate:2018-01-29

According to the American Physical Society portal, American researchers have used nano-silver wires to develop highly conductive and highly flexible conductive materials. The results were published in the prestigious academic journal Advanced Materials.

Researchers from North Carolina State University have developed highly conductive and elastic conductors made from silver nanoscale wires (nanowires). These elastic conductors could be used to develop stretchable electronic devices.

For example, an electronic "skin" could help robots pick up delicate objects without breaking them, and stretchable displays and antennas could make cell phones and other stretch and compress Without affecting their performance. However, the first step toward making such applications possible is to produce conductors that are elastic and able to effectively and varying transmit regardless of whether they are deformed.

Dr. Yong Zhu, an assistant professor of mechanical and at NC State, and Feng Xu, a Ph.D. student in Zhu's lab have developed such elastic conductors using silver nanowires.

And the new technique developed at NC State embeds highly conductive silver nanowires in a polymer that can withstand significant stretching without adversely affecting the material's conductivity. This makes it attractive as a component For use in stretchable electronic devices.

"This addition is very exciting because it could be immediately applied to a broad range of applications," Zhu said. "In addition, our work focuses on high and stable conductivity under a large degree of deformation, most to work using silver nanowires That are more concerned with flexibility and transparency."

The polymer is then exposed to high , which turns the polymer from a liquid into an elastic Because the polymer flows around the silver nanowires when it is in liquid form, the nanowires are trapped in the polymer when it becomes solid. The polymer can then be peeled off the silicon plate.

"Also silver nanowires can be printed to fabricate patterned stretchable conductors," Xu says. The fact that it is easy to make patterns using the silver nanowire conductors should facilitate the technique's use in electronics manufacturing.

When the nanowire-embedded polymer is stretched and relaxed, the surface of the polymer containing nanowires buckles. The end result is that the composite is flat on the side that contains no nanowires, but wavy on the side that contains silver nanowires.

After the nanowire-embedded surface has buckled, the material can be stretched up to 50 percent of its elongation, or tensile strain, without affecting the conductivity of the silver nanowires. This is because the buckled shape of the material allows the nanowires to stay in a fixed position relative to each other, even as the polymer is being stretched.

"In addition to having high conductivity and a large stable strain range, the new stretchable show excellent robustness under repeated mechanical loading," Zhu said. Other reported stretchable conductive materials are typically deposited on top of substrates and could delaminate under repeated mechanical stretching or Surface rubbing.


More information: The paper, "Highly Conductive and Stretchable Silver Nanowire Conductors," was published online July 12 in Advanced Materials .


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