Redox Cycling in Nanopore-Confined Recessed Dual-Ring Electrode Arrays
| Autor: | Kaiyu Fu, Donghoon Han, Paul W. Bohn, Lawrence P. Zaino |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Analytical chemistry Limiting current 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Redox Reference electrode Focused ion beam 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Nanopore General Energy Electrode Physical and Theoretical Chemistry Cyclic voltammetry 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry C. 120:20634-20641 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.6b01287 |
| Popis: | A redox cycling geometry based on an array of nanopore-confined recessed dual-ring electrodes (RDREs) has been devised to amplify electrochemical signals and enhance the sensitivity of electroanalytical measurements. The RDRE arrays were fabricated using layer-by-layer deposition followed by focused ion beam milling. A characteristic feature of the nanoscale dual-ring geometry is that electrochemical reactions occurring at the bottom-ring electrode can be tuned by modulating the potential at the top-ring electrode. Thus, the resulting device was operated in generator–collector mode by holding the top-ring electrodes at a constant potential and performing cyclic voltammetry by sweeping the bottom-ring potential in aqueous Fe(CN)63–/4–. The enhanced (∼23×) limiting current, achieved by cycling the redox couple between top- and bottom-ring electrodes with high collection efficiency, was compared with that obtained in the absence of self-induced redox cycling (SIRC). Measured shifts in Fe(CN)63–/4– concentrat... |
| Databáze: | OpenAIRE |
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