title: DNA sensing by field-effect transistors based on networks of carbon nanotubes.
abstract: 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.
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University 50, Nanyang Avenue, Singapore, 639798.
authors.forename: Ee Ling
authors.initials: EL
authors.lastname: Gui
authors.forename: Lain-Jong
authors.initials: LJ
authors.lastname: Li
authors.forename: Keke
authors.initials: K
authors.lastname: Zhang
authors.forename: Yangping
authors.initials: Y
authors.lastname: Xu
authors.forename: Xiaochen
authors.initials: X
authors.lastname: Dong
authors.forename: Xinning
authors.initials: X
authors.lastname: Ho
authors.forename: Pooi See
authors.initials: PS
authors.lastname: Lee
authors.forename: Johnson
authors.initials: J
authors.lastname: Kasim
authors.forename: Z X
authors.initials: ZX
authors.lastname: Shen
authors.forename: John A
authors.initials: JA
authors.lastname: Rogers
authors.forename: S G
authors.initials: SG
authors.lastname: Mhaisalkar
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D002857:Chromium / Q000737:chemistry; D015342:DNA Probes / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D006046:Gold / Q000737:chemistry; D017403:In Situ Hybridization / Q000295:instrumentation / Q000379:methods*; D008856:Microscopy, Fluorescence; D037742:Nanotubes, Carbon / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D014173:Transistors, Electronic
chemical_list: D015342:DNA Probes; D037742:Nanotubes, Carbon; D002857:Chromium; D006046:Gold