We start with a porous material that is easy to make. The porous material is formed directly on the surface of a silicon wafer. In the process of making the porous material, we embedded a catalyst inside the pores. The catalyst particles are used to nucleate the nanotubes in a specific location. The wafer is placed in a plasma-enhanced deposition system that creates a carbon vapor that, when in contact with the catalyst particles, starts the growth of a carbon nanotube. The nanotubes self assemble and only one carbon nanotube forms per pore. There is no way a second nanotube will form in the same pore. The nanotubes grow vertically and eventually project out of the pores.
Was this article helpful?