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Title: 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
Authors: Allsop, Thomas 
Kundrat, Vojtech 
Kalli, Kyriacos 
Lee, Graham B. 
Neal, Ron 
Bond, Peter 
Shi, Baogul 
Sullivan, John 
Culverhouse, Phil 
Webb, David J. 
Keywords: Fibre optics;Gas sensing;Localized surface plasmons;Metal oxide semiconductors;Optical sensing
Category: Electrical Engineering - Electronic Engineering - Information Engineering
Field: Engineering and Technology
Issue Date: Feb-2018
Publisher: Elsevier B.V.
Source: Sensors and Actuators, B: Chemical, 2018, vol. 255, pp. 843-853
Journal: Sensors and Actuators, B: Chemical 
Abstract: 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.
ISSN: 0925-4005
DOI: 10.1016/j.snb.2017.08.058
Rights: © 2017 The Authors
Type: Article
Appears in Collections:Άρθρα/Articles

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