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Steady-State Voltammetric Response of the Nanopore Electrode
- Source :
- Analytical Chemistry. 78:477-483
- Publication Year :
- 2005
- Publisher :
- American Chemical Society (ACS), 2005.
-
Abstract
- The steady-state voltammetric response of the truncated conical-shaped glass nanopore electrode is presented. Analytical theory, finite-element simulations, and experimental measurement of the diffusive flux of a redox molecule through the pore orifice demonstrate that the steady-state current decreases rapidly as the pore depth increases and then asymptotically approaches a constant value when the pore depth is approximately 50x larger than the pore orifice. The asymptotic limit of the steady-state current is only a function of the pore orifice radius and the cone angle of the pore and has a finite value for all cone angles greater than zero. Experimental confirmation of the predicted dependence on pore depth is obtained using nanopore electrodes with 100-1000 nm orifice radii, by measuring the steady-state voltammetric current corresponding to the oxidation of ferrocene in acetonitrile solutions containing an excess of supporting electrolyte.
- Subjects :
- Quantitative Biology::Biomolecules
Physics::Biological Physics
Steady state
Metallocenes
Supporting electrolyte
Chemistry
Finite Element Analysis
Analytical chemistry
Radius
Molecular physics
Nanostructures
Analytical Chemistry
Quantitative Biology::Subcellular Processes
Nanopore
Electrode
Electrochemistry
Microscopy, Electron, Scanning
Ligand cone angle
Ferrous Compounds
Electrodes
Oxidation-Reduction
Voltammetry
Computer Security
Body orifice
Subjects
Details
- ISSN :
- 15206882 and 00032700
- Volume :
- 78
- Database :
- OpenAIRE
- Journal :
- Analytical Chemistry
- Accession number :
- edsair.doi.dedup.....9486c815282429fb2f35c5bfba619405