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. © 2007 American Chemical Society.
CITATION STYLE
Ee, L. G., Li, L. J., Zhang, K., Xu, Y., Dong, X., Ho, X., … Mhaisalkar, S. G. (2007). DNA sensing by field-effect transistors based on networks of carbon nanotubes. Journal of the American Chemical Society, 129(46), 14427–14432. https://doi.org/10.1021/ja075176g
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