Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10266930 | Electrochemistry Communications | 2011 | 4 Pages |
Abstract
The use of single walled carbon nanotube (SWNT) band electrodes in a channel flow cell, for low concentration detection, with hydrodynamic voltammetry is reported. A two dimensional SWNT network electrode is combined with a one piece channel flow cell unit, fabricated by microstereolithography. This configuration provides well defined hydrodynamics over a wide range of volume flow rates (0.05-25 mL minâ 1). Limiting current measurements, from linear sweep voltammograms, are in good agreement with the channel electrode Levich equation, for the one electron oxidation of ferrocenylmethyl trimethylammonium (FcTMA+), over a wide concentration range, 1 Ã 10â 8 M to 2.1 Ã 10â 5 M, with a detection limit of 5 nM. At the highest flow rates, some influence of the slightly recessed electrode geometry arising from the SWNT electrode fabrication is noted. However, this can be accounted for by a full simulation of the hydrodynamics and solution of the resulting convection-diffusion equation. Application of this hydrodynamic configuration to the voltammetric detection of dopamine is also demonstrated.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Michael E. Snowden, Patrick R. Unwin, Julie V. Macpherson,