They then attached strips of gold to both ends of each nanotube,
creating a transistor, and linked up to three such devices in various ways to make
circuits that would execute
simple logical functions: flipping a signal from off to on or vice versa, turning two off signals into an on, storing a unit of information or
creating an oscillating signal.
Chemist Charles Lieber and co-workers at Harvard University
created simple logic
circuits incorporating up to six transistors by crisscrossing nanometer - wide wires of silicon and gallium - nitride, each junction of which forms a transistor.