Winter Slipper

Pen That Draws Real Circuits

Researchers from the Tsinghua University in Beijing have created an amazing pen that draws real circuits. The pen is capable of drawing carbon nanotube fibers longer than half a metre. It has been demonstrated that the pen can be used to draw complex patterns of circuits with high conductivity.

Pen That Draws Real Circuits

The pen itself is actually an everyday commercial pen. It is the ink that allows it to draw the circuits.  The ink is made up of electrically conductive carbon nanotube fibers and a viscous polymer solution called polyethylene oxide.

ink circuits

The polyethylene oxide is highly elastic and very strong mechanically. The pen can be lifted from the paper during writing in order to stretch or reposition the fibers.

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