title: Probing electrostatic potentials in solution with carbon nanotube transistors.
abstract: We have used single-walled carbon nanotube transistors to measure changes in the chemical potential of a solution due to redox-active transition-metal complexes. The interaction of the molecules with a gold electrolyte-gate wire changes the electrostatic potential sensed by the nanotube, which in turn shifts the gate-voltage dependence of the nanotube conductance. As predicted by the Nernst equation, this shift depends logarithmically on the ratio of oxidized to reduced molecules.
authors.affiliation: Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA.
authors.forename: Lisa
authors.initials: L
authors.lastname: Larrimore
authors.forename: Suddhasattwa
authors.initials: S
authors.lastname: Nad
authors.forename: Xinjian
authors.initials: X
authors.lastname: Zhou
authors.forename: Héctor
authors.initials: H
authors.lastname: Abruña
authors.forename: Paul L
authors.initials: PL
authors.lastname: McEuen
mesh_terms: D000465:Algorithms; D006046:Gold / Q000737:chemistry; D018625:Microscopy, Atomic Force; D037742:Nanotubes, Carbon; D010084:Oxidation-Reduction; D012996:Solutions / Q000737:chemistry*; D055672:Static Electricity; D014173:Transistors, Electronic
chemical_list: D037742:Nanotubes, Carbon; D012996:Solutions; D006046:Gold