Patent ID: 7736943

Claim:
A method of making a transistor device comprising: providing a template having a top surface and a bottom surface comprising a plurality of openings extending into the template from the top surface toward the bottom surface; exposing the template having openings to a hydrocarbon gas at a temperature to grow carbon nanotubes in the openings; forming a mixture of semiconducting carbon nanotubes and metallic carbon nanotubes in the openings; forming a first electrode region on the top surface to electrically couple to the carbon nanotubes at a first point; forming a first gate region in the template extending from a point below the top surface and below the first electrode region toward the bottom surface; forming a second gate region in the template extending from a point below the top surface toward the bottom surface, wherein there is a first carbon nanotube and a second carbon nanotube between the first and second gate regions; and after forming a mixture of semiconducting carbon nanotubes and metallic carbon nanotubes in the openings, removing metallic carbon nanotubes from the mixture.