DNA sensing by field-effect transistors based on networks of carbon nanotubes
Gui, Ee Ling
Lee, Pooi See
Rogers, John A.
Mhaisalkar, Subodh Gautam
Date of Issue2007
School of Materials Science and Engineering
We report on the sensing mechanism of electrical detection of deoxyribonucleic acid (DNA) hybridization for Au- and Cr-contacted field effect transistors based on single-walled carbon nanotube (SWCNT) networks. Barrier height extraction via low-temperature electrical measurement provides direct evidence for the notion that the energy level alignment between electrode and SWCNTs can be affected by DNA immobilization and hybridization. The study of location-selective capping using photoresist provides comprehensive evidence that the sensing of DNA is dominated by the change in metal−SWCNT junctions rather than the channel conductance.
Journal of the American chemical society
© 2007 American Chemical Society