SCIENCE SPIN-OFFS

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Your future smartwatch might be printed with an inkjet printer

By Gabriel PopkinNov. 1, 2016 , 3:00 AM

They printed the 3-micrometer-tall circuits one layer at a time with an inkjet printer: On the bottom, they laid down the carbon-based compound that would form the parts from which electrical current would flow into and out of one transistor, then the metal electrodes that would control the current in both transistors, and, finally, the compound that would form the current-carrying parts of the other transistor. Between the layers of transistors they deposited thin films of a protective material called parylene. The device included more than 100 transistors, enough to form logical circuits that completed several basic computations, including adding two numbers.

http://www.sciencemag.org/news/2016/11/your-future-smartwatch-might-be-printed-inkjet-printer