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.
DOI
10.1016/j.snb.2017.08.058
Publication Date
2018-02-01
Publication Title
Sensors and Actuators B: Chemical
Volume
255
Publisher
Elsevier BV
ISSN
0925-4005
Embargo Period
2024-11-22
Keywords
Fibre optics, Gas sensing, Localized surface plasmons, Metal oxide semiconductors, Optical sensing
First Page
843
Last Page
853
Recommended Citation
Allsop, T., Kundrat, V., Kalli, K., Lee, G., & et al. (2018) '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', Sensors and Actuators B: Chemical, 255, pp. 843-853. Elsevier BV: Available at: https://doi.org/10.1016/j.snb.2017.08.058
