A copy of the painting "Sae-Han-Do" by Jung Hee Kim, drawn in conductive ink (Image: Bok Yeop Ahn)
Hand-drawn silver ink lines form the interconnects between the flexible array of LEDs mounted on paper (Image: Bok Yeop Ahn)
The silver pen can write electric circuits and interconnects directly on paper and other surfaces (Image: Bok Yeop Ahn)
People have been using pens to jot down their thoughts for thousands of years but now engineers at the University of Illinois have developed a silver-inked rollerball pen that allows users to jot down electrical circuits and interconnects on paper, wood and other surfaces. Looking just like a regular ballpoint pen, the pen’s ink consists of a solution of real silver that dries to leave electrically conductive silver pathways. These pathways maintain their conductivity through multiple bends and folds of the paper, enabling users to personally fabricate low-cost, flexible and disposable electronic devices.
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