Patent ID: 8766326

Claim:
A sensor for detecting a detection target, the sensor comprising: a transistor selected from the group of field-effect transistors or single-electron transistors, the transistor having a substrate having a first side and a second side, the second side being opposed to the first side, the substrate being formed of an insulating material, a source electrode disposed on the first side of the substrate and a drain electrode disposed on the first side of the substrate, and a carbon nano tube channel forming a current path between the source electrode and the drain electrode, the channel being spaced from the substrate and bridging over the substrate from a first end point on the source electrode to a second end point on the drain electrode; a interaction-sensing gate disposed on the second side of the entire substrate, the interaction-sensing gate immobilizing a specific substance that is capable of selectively interacting with the detection target, the interaction-sensing gate being formed of a conductor; a gate for applying a gate voltage to adjust a characteristic of the transistors; wherein the gate is a side gate disposed on the side of the channel on the first side of the substrate; wherein the detection target changes the characteristic of the transistor when interacting with the specific substance.