US Patent 7854826 - CNT transistor biosensor

http://www.freepatentsonline.com/7854826.html

This patent from Korea Research Institute of Chemical Technology teaches a carbon nanotube transistor biosensor capable of recognizing a specific protein by using DNA aptamers. Claim 1 reads:

1. A carbon nanotube transistor biosensor using a single stranded DNA or single stranded RNA aptamer, comprising:

(a) a carbon nanotube transistor comprising a source, a drain, and a gate, and a channel domain which consists of a carbon nanotube;

(b) a single stranded DNA or single stranded RNA aptamer immobilized on the surface of said carbon nanotube for molecular recognition, and

(c) a linker material to immobilize aptamers on the surface of a carbon nanotube;

wherein said carbon nanotube transistor biosensor contains an electrical double layer.