A nanometer potential probe for the measurement of electrochemical potential of solution
SCIE
SCOPUS
- Title
- A nanometer potential probe for the measurement of electrochemical potential of solution
- Authors
- Yoon, YH; Shin, T; Shin, EY; Kang, H; Yoo, JS; Park, SM
- Date Issued
- 2007-04-01
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Abstract
- We constructed a miniaturized potential probe from a gold electrode of nanometer size and a potentiometer with high input impedance and examined its performance for reading the electrochemical potential of solutions. Electrochemical potential of the solution was changed either by varying the ratio of a Fe(CN)(6)(3-) /Fe(CN)(6)(4-) redox couple in solution or by changing the inner potential of the solution through the electrode bias control. The response of a probe to these potential changes was measured. The probe impedance was estimated from the dynamic response to a step-function change in solution potential. The interfacial resistance of a probe increased with decrease in the probe size and the redox concentration, showing 10(10) to 10(12) Omega for the probes with a radius of 50-400 nm in 0.5-10 mM solutions. The interfacial resistance originated mostly from charge transfer reactions for such tiny probes. Owing to high interfacial resistance, the potential measured by a probe exhibited an overpotential as compared to the open circuit potential (ocp) of solution. It is demonstrated that the dynamic response offers a versatile means to characterize a nanometer potential probe and to calibrate the overpotential appearing in the potential measurement under the working condition. (c) 2007 Elsevier Ltd. All rights reserved.
- Keywords
- ultramicroelectrode; open circuit potential; inner potential; interface; charge transfer reaction; ELECTRON-TRANSFER; FABRICATION; DIMENSIONS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/23425
- DOI
- 10.1016/J.ELECTRA.20
- ISSN
- 0013-4686
- Article Type
- Article
- Citation
- ELECTROCHIMICA ACTA, vol. 52, no. 14, page. 4614 - 4621, 2007-04-01
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