Methane detection scheme based upon the changing optical constants of a zinc oxide/platinum matrix created by a redox reaction and their effect upon surface plasmons


We detect changes in the optical properties of a metal oxide semiconductor (MOS), ZnO, in a multi-thin-film matrix with platinum in the presence of the hydrocarbon gas methane. A limit of detection of 2% by volume with concentrations from 0 to 10% and maximum resolution of 0.15% with concentrations ranging from 30% to 80% at room temperature are demonstrated along with a selective chemical response to methane over carbon dioxide and the other alkane gases. The device yields the equivalent maximum bulk refractive index spectral sensitivity of 1.8 × 105 nm/RIU. This is the first time that the optical properties of MOS have been monitored to detect the presence of a specific gas. This single observation is a significant result, as MOS have a potentially large number of target gases, thus offering a new paradigm for gas sensing using MOSs.

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Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Additional Information: © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( Funding: Grants EP/J010413 and EP/J010391 for Aston University and University of Plymouth from the UK Engineering and Physical Sciences Research Council.
Uncontrolled Keywords: localized surface plasmons,metal oxide semiconductors,optical sensing,gas sensing,fibre optics
Publication ISSN: 0925-4005
Last Modified: 15 Apr 2024 07:22
Date Deposited: 04 Sep 2017 08:15
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Related URLs: https://www.sci ... 925400517314806 (Publisher URL)
PURE Output Type: Article
Published Date: 2018-02-01
Published Online Date: 2017-08-23
Accepted Date: 2017-08-07
Authors: Allsop, Thomas (ORCID Profile 0000-0001-8905-9014)
Kundrat, Vojtěch
Kalli, Kyriacos
Lee, Graham B.
Neal, Ron
Bond, Peter
Shi, Baogul
Sullivan, John
Culverhouse, Phil
Webb, David J. (ORCID Profile 0000-0002-5495-1296)



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