1. We then take our pencil lead and draw our carbon nanotubes-based sensor between the electrodes.
2. Also, one is pretty and one is pencil lead.
3. To make our pencil lead we take a commercial powder of carbon nanotubes and compress it into the shape of a lead using a press.
4. But it's just carbon, the same element that makes up the graphite in this pencil lead, which is so soft, that it's intended purpose is to rub off on stuff.