This title appears in the Scientific Report :
2014
Please use the identifier:
http://dx.doi.org/10.1039/c3nr03818a in citations.
Please use the identifier: http://hdl.handle.net/2128/5779 in citations.
Redox cycling in nanoporous electrochemical devices
Redox cycling in nanoporous electrochemical devices
Nanoscale redox cycling is a powerful technique for detecting electrochemically active molecules, based on fast repetitive oxidation and reduction reactions. An ideal implementation of redox cycling sensors can be realized by nanoporous dual-electrode systems in easily accessible and scalable geomet...
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Personal Name(s): | Hüske, Martin |
---|---|
Stockmann, Regina / Offenhäusser, Andreas / Wolfrum, Bernhard (Corresponding author) | |
Contributing Institute: |
JARA-FIT; JARA-FIT Bioelektronik; PGI-8 Bioelektronik; ICS-8 |
Published in: | Nanoscale, 6 (2014) 1, S. 589 -598 |
Imprint: |
Cambridge
RSC Publ.
2014
|
DOI: |
10.1039/c3nr03818a |
PubMed ID: |
24247480 |
Document Type: |
Journal Article |
Research Program: |
Helmholtz Young Investigators Group Physics of the Cell Sensorics and bioinspired systems |
Link: |
Get full text OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/5779 in citations.
Nanoscale redox cycling is a powerful technique for detecting electrochemically active molecules, based on fast repetitive oxidation and reduction reactions. An ideal implementation of redox cycling sensors can be realized by nanoporous dual-electrode systems in easily accessible and scalable geometries. Here, we introduce a multi-electrode array device with highly efficient nanoporous redox cycling sensors. Each of the sensors holds up to 209[thin space (1/6-em)]000 well defined nanopores with minimal pore radii of less than 40 nm and an electrode separation of [similar]100 nm. We demonstrate the efficiency of the nanopore array by screening a large concentration range over three orders of magnitude with area-specific sensitivities of up to 81.0 mA (cm−2 mM−1) for the redox-active probe ferrocene dimethanol. Furthermore, due to the specific geometry of the material, reaction kinetics has a unique potential-dependent impact on the signal characteristics. As a result, redox cycling experiments in the nanoporous structure allow studies on heterogeneous electron transfer reactions revealing a surprisingly asymmetric transfer coefficient. |