Raith, Timo and Iffelsberger, Christian and Vatsyayan, Preety and Matysik, Frank-Michael (2019) Impacts of Forced Convection Generated via High Precision Stirring on Scanning Electrochemical Microscopy Experiments in Feedback Mode. ELECTROANALYSIS, 31 (2). pp. 273-281. ISSN 1040-0397, 1521-4109
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In this study, the effects of forced convection on scanning electrochemical microscopy (SECM) experiments in feedback mode using ferrocenemethanol as redox mediator are presented. Forced convection, which enhances the mass transfer inside the system, was generated via an electrical high precision stirrer integrated into the SECM setup. A thin-film interdigitated array electrode serving as model substrate was investigated with probe scan curves in z-direction and SECM imaging in constant height mode utilizing ultramicroelectrodes (UME) with diameters (d(probe)) of 25m and 12.5m. It was found that forced convection increased the overall current during SECM imaging without distorting distinctive features of the imaged structure when working with a 25m UME at substrate-to-tip distances of 14m and 11m. Furthermore, the electrochemical contrast was improved under hydrodynamic conditions for a substrate-to-tip distance of 11m and scan rates of 5ms(-1), 10ms(-1), 20ms(-1) and 40ms(-1). When further decreasing the gap between the UME and the substrate to 9m almost no effects of the forced convection were observed. Consequently, for a 25m UME, forced convection led to higher currents and improved performance during SECM experiments in feedback mode at substrate-to-tip distances of 14m and 11m, whereas no effects were observed for a 12.5m UME at a distance of 8m.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | THERMAL-CONVECTION; CELL; TIP; Electrochemistry; Feedback mode; Forced convection; Scanning electrochemical microscopy; Scanning probe microscopy |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Instrumentelle Analytik (Prof. Frank-Michael Matysik) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 25 May 2022 06:44 |
| Last Modified: | 25 May 2022 06:44 |
| URI: | https://pred.uni-regensburg.de/id/eprint/27624 |
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