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Characterization of electrode materials for dielectric spectroscopy.

Characterization of electrode materials for dielectric spectroscopy.
Characterization of electrode materials for dielectric spectroscopy.
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.
16104
Malleo, D
1a5bad9a-132f-4fdc-a523-988bcf44a824
Nevill, J T
184907db-eb0f-477a-90d1-39851c0a2f85
van Ooyen, A
a3549dbd-25d3-43e1-b733-fddb2c35ccb5
Schnakenberg, U
1db6dbc1-18ea-4eeb-b177-3ce3826d1a45
Lee, L P
6f1a620e-9f7e-41f2-81a4-07bc5c1989de
Morgan, H
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Malleo, D
1a5bad9a-132f-4fdc-a523-988bcf44a824
Nevill, J T
184907db-eb0f-477a-90d1-39851c0a2f85
van Ooyen, A
a3549dbd-25d3-43e1-b733-fddb2c35ccb5
Schnakenberg, U
1db6dbc1-18ea-4eeb-b177-3ce3826d1a45
Lee, L P
6f1a620e-9f7e-41f2-81a4-07bc5c1989de
Morgan, H
de00d59f-a5a2-48c4-a99a-1d5dd7854174

Malleo, D, Nevill, J T, van Ooyen, A, Schnakenberg, U, Lee, L P and Morgan, H (2010) Characterization of electrode materials for dielectric spectroscopy. Review of Scientific Instruments, 81, 16104.

Record type: Article

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.

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More information

Published date: 2010
Additional Information: Imported from ISI Web of Science
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 270742
URI: https://eprints.soton.ac.uk/id/eprint/270742
PURE UUID: 7ea5b59a-c973-42ff-8b30-057def5f7696
ORCID for H Morgan: ORCID iD orcid.org/0000-0003-4850-5676

Catalogue record

Date deposited: 21 Apr 2010 07:45
Last modified: 29 Aug 2019 00:44

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Contributors

Author: D Malleo
Author: J T Nevill
Author: A van Ooyen
Author: U Schnakenberg
Author: L P Lee
Author: H Morgan ORCID iD

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