Probing electrostatic potentials in solution with carbon nanotube transistors.
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.
Larrimore
Lisa
L
Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA.
Nad
Suddhasattwa
S
Zhou
Xinjian
X
Abruña
Héctor
H
McEuen
Paul L
PL
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
D037742:Nanotubes, Carbon; D012996:Solutions; D006046:Gold