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How have researchers developed printed electronics?

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Researchers from the US and China have recognised the importance of directly printing electronics to users, and thus have developed a method for doing so using metallic nanoparticles that can be sintered at very low temperatures. While the researchers were able to lower the sintering temperature by adding nanoparticles, it was still too high for use with human skin (100°C). Instead, the lowered sintering temperature was combined with an aid consisting of PVA paste and calcium carbonate, and the result is sintering at room temperature that does not burn or hurt the skin. The developed technique allows for the printed design to remain adhered to the skin when wetted and removed easily when rinsed under hot water.