An Electrochemical Coulomb Staircase: Detection of Single Electron-Transfer Events at Nanometer Electrodes

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Science  19 Sep 1997:
Vol. 277, Issue 5333, pp. 1791-1793
DOI: 10.1126/science.277.5333.1791

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The current-potential curve at a 2.8-nanometer-radius electrode immersed in a solution containing micromolar concentrations of a redox couple, [(trimethylammonio)methyl] ferrocene (Cp2FeTMA+)/Cp2FeTMA2+, shows discrete steps (a coulomb staircase) representing single electron-transfer events. Discrete potential steps are also found in the current-time curve as the electrode potential relaxes back to equilibrium after a coulostatic potential step.

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