A field effect transistor and a method for making the same. In one
embodiment, the field effect transistor comprises a source; a drain; a
gate; at least one carbon nanotube on the gate; and a dielectric layer
that coats the gate and a portion of the at least one carbon nanotube,
wherein the at least one carbon nanotube has an exposed portion that is
not coated with the dielectric layer, and wherein the exposed portion is
functionalized with at least one indicator molecule. In other
embodiments, the field effect transistor is a biochem-FET.