Manipulation of carbon nanotubes and properties of nanotube field-effect transistors and rings

Using the tip of an atomic force microscope, we have manipulated individual carbon nanotubes on a patterned substrate, and have fabricated model nanod evices, including a room temperature field-effect transistor with a channel only 1.6 nm wide, as well as single-electron transistors. We have also dev eloped a technique to produce rings of single-wall nanotubes with a very hi gh yield.