Characterization of electrode materials for dielectric spectroscopy.
Malleo, D, Nevill, J T, van Ooyen, A, Schnakenberg, U, Lee, L P and Morgan, H (2010) Characterization of electrode materials for dielectric spectroscopy. Rev Sci Instrum, 81, 016104.
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Description/Abstract
When measuring the dielectric properties of aqueous samples, the impedance of the electrode/sample interface can limit low frequency measurements. The electrode polarization problem can be reduced by increasing the effective surface area of the electrodes. In this work, impedance spectroscopy was used to characterize and compare three different electrode surfaces that can be used to mitigate this effect: platinum black, iridium oxide, and [polypyrrole/poly(styrenesulphonate)] (PPy/PSS) conducting polymer. All three materials were directly compared with a bright platinum electrode. Equivalent circuit models were used to extract the increase in the effective surface area of the electrodes: platinum black, iridium oxide and PPy/PSS increase the effective capacitance of the electrode by factors of approximately 240, 75, and 790, respectively. The practical aspects of all electrode materials are discussed. These results suggest that iridium oxide and PPy/PSS are good alternatives to the commonly used platinum black, which is prone to mechanical damage (scratches) and is potentially toxic to cells.
| Item Type: | Article |
|---|---|
| Additional Information: | Imported from ISI Web of Science |
| Divisions: | Faculty of Physical and Applied Science > Electronics and Computer Science > NANO |
| Item ID: | 270742 |
| Date Deposited: | 21 Apr 2010 07:45 |
| Last Modified: | 02 Mar 2012 13:01 |
| Contributors: | Malleo, D (Author) Nevill, J T (Author) van Ooyen, A (Author) Schnakenberg, U (Author) Lee, L P (Author) Morgan, H (Author) |
| Date: | 2010 |
| Additional Information: | Imported from ISI Web of Science |
| Status: | Unpublished |
| Further Information: | Google Scholar |
| ISI Citation Count: | 8 |
| URI: | http://eprints.soton.ac.uk/id/eprint/270742 |
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