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.
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.
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.
If you found this article interesting you might also enjoy these articles;