Probing Electrostatic Potentials in Solution with Carbon Nanotube Transistors
journal contributionposted on 12.07.2006 by Lisa Larrimore, Suddhasattwa Nad, Xinjian Zhou, Héctor Abruña, Paul L. McEuen
Any type of content formally published in an academic journal, usually following a peer-review process.
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.