New transparent electric conductors can be stretched like rubber bands

A research team led by Ren Zhifeng, a professor at the University of Houston and a famous Chinese nanomaterial expert Ren Zhifeng, recently developed a transparent electrical conductor that can be cyclically stretched like a rubber band without changing performance. This achievement has been widely used in fields such as flexible electronics and human implantable devices.

According to research papers published recently in the "Journal of the National Academy of Sciences" of the United States, Ren Zhifeng's team used the "nano-grain boundary processing method" created by him to prepare a network structure of metal nanowires with a precise, controllable shape of fishnets, bends, and widths, and then adhered them. A flexible substrate made of polydimethylsiloxane is made into a transparent electrical conductor that is stretchable and free from fatigue.

Ren Zhifeng told Xinhua News Agency reporter that in the test test, this electric conductor achieved 4 times stretching, at this time also has the conductive and transparent properties equivalent to the commercialized indium tin oxide transparent conductive film. Overall, the electrical conductor can be stretched 2.5 times up to 50,000 cycles, and the resistance, light transmittance, and structure remain essentially unchanged. "That is to say, the electrical conductor can be stretched like a rubber band and always maintain good electrical conductivity and transparency."

Ren Zhifeng said that fatigue is a deadly enemy of metal materials, and metal materials usually break down after thousands of cycles in a small deformation (eg, 1%). Their stretchable transparent electrical conductors solve the fatigue problem. One reason is that the gold nanowire network of the electrical conductor itself has good tensile properties. In addition, they found that adjusting the adhesion between the metal network and its substrate, also Can effectively improve the tensile properties and eliminate strain fatigue problems. (Reporter Lin Xiaochun)

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