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Metal oxide sensors for long term pH monitoring

Metal oxide sensors for long term pH monitoring
Metal oxide sensors for long term pH monitoring
The determination of pH, a measure of concentration of hydrogen ions in a solution, is an important task in analytical chemistry since various biological and chemical reaction mechanisms are pH dependent. While the conventional glass type electrodes are widely used for their high accuracy; they are not amenable to miniaturization, and suffer from sluggish response [1], [2], [3]. Various solid-state metal oxide pH sensing electrodes, chiefly iridium oxide and ruthenium oxide (RuOx), have been investigated as an alternate. RuOx exhibits several unique advantages over other metal oxides such as thermal stability, excellent corrosion resistance, low hysteresis, low cost and high sensitivity [4]. In this work, we developed and investigated the long-term performance of the RuOx films on platinum electrode. The sensors exhibited near-Nernstian response at 55 mV/pH and long-term stability of over 4 weeks.
Kalsi, Sumit
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Mingels, Roeland
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Lu, Shilong
dd32fc76-bc64-44a3-8279-888e1866e775
Cheong, Ying
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Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Kalsi, Sumit
0ec1f5c2-a6ec-4c07-92fb-15708c28742e
Mingels, Roeland
5aff76af-9298-44d6-9a58-a5279cf8c011
Lu, Shilong
dd32fc76-bc64-44a3-8279-888e1866e775
Cheong, Ying
4efbba2a-3036-4dce-82f1-8b4017952c83
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174

Kalsi, Sumit, Mingels, Roeland, Lu, Shilong, Cheong, Ying and Morgan, Hywel (2018) Metal oxide sensors for long term pH monitoring. NanoBioTech Montreux Conference, Montreux, Switzerland. 2 pp .

Record type: Conference or Workshop Item (Other)

Abstract

The determination of pH, a measure of concentration of hydrogen ions in a solution, is an important task in analytical chemistry since various biological and chemical reaction mechanisms are pH dependent. While the conventional glass type electrodes are widely used for their high accuracy; they are not amenable to miniaturization, and suffer from sluggish response [1], [2], [3]. Various solid-state metal oxide pH sensing electrodes, chiefly iridium oxide and ruthenium oxide (RuOx), have been investigated as an alternate. RuOx exhibits several unique advantages over other metal oxides such as thermal stability, excellent corrosion resistance, low hysteresis, low cost and high sensitivity [4]. In this work, we developed and investigated the long-term performance of the RuOx films on platinum electrode. The sensors exhibited near-Nernstian response at 55 mV/pH and long-term stability of over 4 weeks.

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More information

Published date: 29 November 2018
Venue - Dates: NanoBioTech Montreux Conference, Montreux, Switzerland, 2018-10-29

Identifiers

Local EPrints ID: 427026
URI: https://eprints.soton.ac.uk/id/eprint/427026
PURE UUID: d1ab7ed7-3111-4d2e-a349-5a8aa037cd74
ORCID for Ying Cheong: ORCID iD orcid.org/0000-0001-7687-4597
ORCID for Hywel Morgan: ORCID iD orcid.org/0000-0003-4850-5676

Catalogue record

Date deposited: 20 Dec 2018 17:30
Last modified: 14 Mar 2019 01:44

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