Abstract
The electrochemical behavior of a single molecule can be observed by trapping a small volume of a dilute solution of the electroactive species between an ultramicroelectrode tip with a diameter of ∼15 nanometers and a conductive substrate. A scanning electrochemical microscope was used to adjust the tip-substrate distance (∼10 nanometers), and the oxidation of [(trimethylammonio)methyl] ferrocene (Cp 2 FeTMA + ) to Cp 2 FeTMA 2+ was carried out. The response was stochastic, and anodic current peaks were observed as the molecule moved into and out of the electrode-substrate gap. Similar experiments were performed with a solution containing two redox species, ferrocene carboxylate (Cp 2 FeCOO - ) and Os(bpy) 3 2+ (bpy is 2,2′-bipyridyl).
Keywords
ElectrochemistryMoleculeChemistryNanotechnologyMaterials scienceElectrodeOrganic chemistryPhysical chemistry
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Publication Info
- Year
- 1995
- Type
- article
- Volume
- 267
- Issue
- 5199
- Pages
- 871-874
- Citations
- 369
- Access
- Closed
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Cite This
Fu-Ren F. Fan,
Allen J. Bard
(1995).
Electrochemical Detection of Single Molecules.
Science
, 267
(5199)
, 871-874.
https://doi.org/10.1126/science.267.5199.871
Identifiers
- DOI
- 10.1126/science.267.5199.871