Deoxyribonucleic acid sensing device with 40 - nm -gap-electrodes fabricated by low-cost conventional techniques

A sensing device for the detection of a very small amount of the deoxyribonucleic acid (DNA) with the order of femtoliter is described. Such a sensing device has metal electrodes with a 40 nm gap, and is fabricated by low-cost technology with the conventional photolithography and anodic oxidation. Gold (Au) electrodes are used to fix DNA, and the electric currents between two electrodes are measured to detect the existence of DNA. The results indicate that the present device is promising as future very low-cost DNA analyzing chips.