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Soft and flexible electronic products are the direction of innovation in many industries. However, to manufacture such devices, first, there must be a suitable floor plate that can be both mass-produced and cost-effective. According to the report of the American Physicist Organizations Network on December 13, the Lawrence Berkeley National Laboratory of the U.S. Department of Energy recently developed a new technology that can produce flexible substrates on a large scale at a low cost. Imprinting circuits will become a variety of “smart devices†such as electronic screens that can be folded like paper, paints that can monitor surface cracks and flaws, medical bandages that can treat infections, and foods that can sense deterioration or not. Packaging and so on. Related papers were published in the recently published Nano Express.
The new technology uses semiconductor concentrated carbon nanotube solutions to produce thin-film transistor networks with excellent electrical properties such as carrier mobility. The team used a solution of 99% semiconductor single-walled carbon nanotubes (SWNTs) concentrated as a substrate, combined with a highly elastic polyimide polymer as a substrate, and the substrate was laser cut into hexagons with a side length of 3.3 mm. The honeycomb pattern was then deposited on the substrate with the silicon and aluminum oxide layers, and the bottom plate was made.
Researchers say that in electronic devices, the higher the ratio of on/off currents, the better, and the clearer the pixels of the sensor. The 99% high purity provides up to 100 on/off current ratios. "Using this solution process technology, we can use single-walled carbon nanotubes to create highly uniform thin-film transistor arrays to create a flexible and flexible active matrix substrate. This technology, combined with metal ink-jet printing, is expected to reduce production flexibility. The cost of electronic equipment," said Ali Jevy, professor of electrical engineering and computer science at the University of California, Berkeley, and material science division at Berkeley Lab.
In order to demonstrate the efficacy of the carbon nanotube substrate, the researchers also fabricated an e-skin sensor consisting of 96 sensor pixel arrays. Each pixel is controlled by a thin film transistor switch and can sense 24 square centimeters. The spatial pressure distribution of the range. The sensitivity of the new sensor is 10 times higher than that of the nanowire electronic skin sensor developed by the laboratory last year. In the future, a variety of sensors and other functional components can be added to expand the application of this base plate, making it a multifunctional artificial skin. In addition, SWNT backplanes can also be used in solar cells, pacemeters, clothing, flexible displays and so on. (Chang Lijun)
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