This title appears in the Scientific Report :
2009
Please use the identifier:
http://dx.doi.org/10.1021/ac9014885 in citations.
Electrochemical Correlation Spectroscopy in Nanofluidic Cavities
Electrochemical Correlation Spectroscopy in Nanofluidic Cavities
We introduce both theoretically and experimentally a new electrochemical technique based on measuring the fluctuations of the faradaic current during redox cycling. By analogy with fluorescence correlation spectroscopy (FCS), we refer to this technique as electrochemical correlation spectroscopy (EC...
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Personal Name(s): | Zevenbergen, M. A. G. |
---|---|
Singh, P. S. / Goluch, E. D. / Wolfrum, B. L. / Lemay, S. G. | |
Contributing Institute: |
Institut für Bio- und Nanosysteme - Bioelektronik; IBN-2 JARA-FIT; JARA-FIT |
Published in: | Analytical chemistry, 81 (2009) S. 8203 - 8212 |
Imprint: |
Columbus, Ohio
American Chemical Society
2009
|
Physical Description: |
8203 - 8212 |
DOI: |
10.1021/ac9014885 |
PubMed ID: |
19743869 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Analytical Chemistry
81 |
Subject (ZB): | |
Publikationsportal JuSER |
We introduce both theoretically and experimentally a new electrochemical technique based on measuring the fluctuations of the faradaic current during redox cycling. By analogy with fluorescence correlation spectroscopy (FCS), we refer to this technique as electrochemical correlation spectroscopy (ECS). We first derive an analytical expression of the power spectral density for the fluctuations in a thin-layer-cell geometry. We then show agreement with measurements using ferrocenedimethanol, Fc(MeOH)2, in water and in acetonitrile in microfabricated thin-layer cells with a approximately 70 nm electrode spacing. The fluctuation spectra provide detailed information about the adsorption dynamics of Fc(MeOH)2, which cause an apparent slowing of Brownian motion. We furthermore observe high-frequency fluctuations from which we estimate the rates of adsorption and desorption. |