IBM has made an integrated circuit from carbon nanotubes:

With an 18-micron long carbon nanotube, the scientists built a 10-transistor ring oscillator, a device typically constructed to test new manufacturing technologies or materials. Using one instead of many carbon nanotubes to build an IC reduces the manufacturing steps and therefore cost…

…Electrical current moves more freely and faster through carbon nanotube than silicon, making carbon nanotube a more energy-efficient material for a speedier chip. It also is super small. A nanometer is a billionth of a meter, and a carbon nanotube is 50,000 times thinner than a human hair.

All these properties make carbon nanotube an appealing candidate for improving performance by piling on more and smaller transistors on a chip without causing overheating.

Moore’s Law marches on.