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000150206 1001_ $$0P:(DE-Juel1)128689$$aHüske, Martin$$b0$$ufzj
000150206 245__ $$aRedox cycling in nanoporous electrochemical devices
000150206 260__ $$aCambridge$$bRSC Publ.$$c2014
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000150206 520__ $$aNanoscale redox cycling is a powerful technique for detecting electrochemically active molecules, based on fast repetitive oxidation and reduction reactions. An ideal implementation of redox cycling sensors can be realized by nanoporous dual-electrode systems in easily accessible and scalable geometries. Here, we introduce a multi-electrode array device with highly efficient nanoporous redox cycling sensors. Each of the sensors holds up to 209[thin space (1/6-em)]000 well defined nanopores with minimal pore radii of less than 40 nm and an electrode separation of [similar]100 nm. We demonstrate the efficiency of the nanopore array by screening a large concentration range over three orders of magnitude with area-specific sensitivities of up to 81.0 mA (cm−2 mM−1) for the redox-active probe ferrocene dimethanol. Furthermore, due to the specific geometry of the material, reaction kinetics has a unique potential-dependent impact on the signal characteristics. As a result, redox cycling experiments in the nanoporous structure allow studies on heterogeneous electron transfer reactions revealing a surprisingly asymmetric transfer coefficient.
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000150206 7001_ $$0P:(DE-Juel1)128733$$aStockmann, Regina$$b1$$ufzj
000150206 7001_ $$0P:(DE-Juel1)128713$$aOffenhäusser, Andreas$$b2$$ufzj
000150206 7001_ $$0P:(DE-Juel1)128745$$aWolfrum, Bernhard$$b3$$eCorresponding author$$ufzj
000150206 773__ $$0PERI:(DE-600)2515664-0$$a10.1039/c3nr03818a$$gVol. 6, no. 1, p. 589 -$$n1$$p589 -598$$tNanoscale$$v6$$x2040-3372$$y2014
000150206 8564_ $$uhttp://pubs.rsc.org/en/content/articlehtml/2014/nr/c3nr03818a
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