Chuan Wang, assistant professor of engineering at Michigan State University, displays the stretchable electronic material he and his research team developed in his lab. Photo by Kurt Stepnitz.
Engineering researchers at Michigan State University have developed a stretchable integrated circuit that is made entirely using an inkjet printer. Possible applications include an ultrathin smart tablet that could be stretched in size, from small to extra large.
Other applications could include a rubber band-like wrist monitor that measures the wearers heartbeat, or wallpaper that turns an entire wall into an electronic display.
Because the material can be produced on a standard printer, it has a major potential cost advantage over current technologies that are expensive to manufacture.
We can conceivably make the costs of producing flexible electronics comparable to the costs of printing newspapers, said Chuan Wang, assistant professor of electrical and computer engineering. Our work could soon lead to printed displays that can easily be stretched to larger sizes, as well as wearable electronics and soft robotics applications.
The smart fabric is made up of several materials fabricated from nanomaterials and organic compounds. These compounds are dissolved in solution to produce different electronic inks, which are run through the printer to make the devices.
From the ink, Wang and his team have successfully created the elastic material, the circuit and the organic light-emitting diode, or OLED. The next step is combining the circuit and OLED into a single pixel, which Wang estimates will take one to two years. There are generally millions of pixels just underneath the screen of a smart tablet or a large display.
Once the researchers successfully combine the circuit and OLED into a working pixel, the smart fabric can be potentially commercialised.
Conceivably, Wang said, the stretchable electronic fabric can be folded and put in one's pocket without breaking. This is an advantage over current flexible electronics material technology that cannot be folded.
We have created a new technology that is not yet available, Wang said. And we have taken it one big step beyond the flexible screens that are about to become commercially available.
The discovery of the ink-fabricated stretchable circuitry was published recently in the journal ACS Nano. Wang's co-researchers were Le Cai, Suoming Zhang and Jinshui Miao of MSU and Zhibin Yu of Florida State University.
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Chuan Wang, assistant professor of engineering at Michigan State University, displays the stretchable electronic material he and his research team developed in his lab. Photo by Kurt Stepnitz.
