Redox cycling in nanoporous electrochemical devices

被引:28
作者
Hueske, Martin [1 ,2 ]
Stockmann, Regina [1 ,2 ]
Offenhaeusser, Andreas [1 ,2 ,3 ]
Wolfrum, Bernhard [1 ,2 ,3 ]
机构
[1] Forschungszentrum Julich, Inst Bioelect PGI ICS 8 8, D-52425 Julich, Germany
[2] Forschungszentrum Julich, JARA Fundamentals Future Informat Technol, D-52425 Julich, Germany
[3] Rhein Westfal TH Aachen, Inst Phys 4, D-52074 Aachen, Germany
关键词
INTERDIGITATED ARRAY ELECTRODES; NANOBAND ELECTRODES; SELECTIVE DETECTION; RECESSED MICRODISK; DISK ELECTRODES; NANOFLUIDIC CHANNELS; TRANSFER KINETICS; SINGLE MOLECULES; ASCORBIC-ACID; CHIP DEVICE;
D O I
10.1039/c3nr03818a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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 209 000 well defined nanopores with minimal pore radii of less than 40 nm and an electrode separation of similar to 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.
引用
收藏
页码:589 / 598
页数:10
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