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Amperometric oxygen sensor based on a platinum nanoparticle-modified polycrystalline boron doped diamond disk electrode
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Hutton, Laura A., Newton, Mark E., Unwin, Patrick R. and Macpherson, Julie V. (2009) Amperometric oxygen sensor based on a platinum nanoparticle-modified polycrystalline boron doped diamond disk electrode. Analytical Chemistry, Vol.81 (No.3). pp. 1023-1032. doi:10.1021/ac8020906
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Official URL: http://dx.doi.org/10.1021/ac8020906
Abstract
Pt nanoparticle (NP)-modified polycrystalline boron-doped diamond (pBDD) disk electrodes have been fabricated and employed as amperometric sensors for the determination of dissolved oxygen concentration in aqueous solution. pBDD columns were cut using laser micro-machining techniques and sealed in glass, in order to make disk electrodes which were then characterized electrochemically. Electrodeposition of Pt onto the diamond electrodes was optimized so as to give the maximum oxygen reduction peak current with the lowest background signal. Pt NPs, >0-10 nm diameter, were found to deposit randomly across the pBDD electrode, with no preference for grain boundaries. The more conductive grains were found to promote the formation of smaller nanoparticles at higher density. With the use of potential step chronoamperometry, in which the potential was stepped to a diffusion-limited value, a four electron oxygen reduction process was found to occur at the Pt NP-modified pBDD electrode. Furthermore the chronoamperometric response scaled linearly with dissolved oxygen concentration, varied by changing the oxygen/nitrogen ratio of gas flowed into solution. The sensor was used to detect dissolved oxygen concentrations with high precision over the pH range 4-10.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
| Library of Congress Subject Headings (LCSH): | Electrodes, Conductometric analysis, Nanoparticles, Electroforming, Oxidation-reduction reaction, Electrocatalysis, Microelectrodes | ||||
| Journal or Publication Title: | Analytical Chemistry | ||||
| Publisher: | American Chemical Society | ||||
| ISSN: | 0003-2700 | ||||
| Official Date: | 1 February 2009 | ||||
| Dates: |
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| Volume: | Vol.81 | ||||
| Number: | No.3 | ||||
| Number of Pages: | 10 | ||||
| Page Range: | pp. 1023-1032 | ||||
| DOI: | 10.1021/ac8020906 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | BAE SYSTEMS (Firm), Engineering and Physical Sciences Research Council (EPSRC) |
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