Controlled placement of individual carbon nanotubes.

A central challenge for both the science and the technology of carbon nanotubes is the controlled assembly of devices. Here, we report a technique that allows us to place a nanotube with the desired properties in a predetermined location by direct mechanical transfer. We demonstrate single-tube and multiple-tube transfer and electrical characterization of an optically characterized nanotube. The ability to rationally design nanotube devices and circuits will enable more detailed study of the physics and chemistry of nanotubes and provide a stepping stone toward implementation of a wide spectrum of applications.