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

Allsop, Thomas D.P.; Kundrát, Vojtěch; Kalli, Kyriacos; Lee, Graham C. B.; Neal, Ron; Bond, Peter; Shi, Baogul; Sullivan, J. L.; Culverhouse, Phil F.; Webb, David J.

doi:10.1016/j.snb.2017.08.058

Cited by 11 publications

(16 citation statements)

References 31 publications

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“…Furthermore, the authors have observed a similar spectral behaviour with Pt/ZnO composite material in the past. 46 Moreover, this is also consistent with the carbon dioxide results shown in Fig. 6 that produces red wavelength shis; +0.14 nm, that indicates an increase in permittivity, which was previously observed by the authors.…”

Section: The Sensing Of Nitrous Oxide Gassupporting

confidence: 92%

“…Using just the SWNTs gave a reduction reaction with N 2 O, which is documented in the research literature 35,44,45 and is consistent with experimental results observed with another type of SWNTs and another REDOX reaction with carbon dioxide. 46 The addition of the PEI created a change in sign of the wavelength shi produced by the N 2 O or alkane gases. There are several possible reasons for this spectral behaviour.…”

Section: Lodmentioning

confidence: 99%

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Detection of nitrous oxide using infrared optical plasmonics coupled with carbon nanotubes

et al. 2020

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Section: The Sensing Of Nitrous Oxide Gassupporting

confidence: 92%

Section: Lodmentioning

confidence: 99%

Detection of nitrous oxide using infrared optical plasmonics coupled with carbon nanotubes

et al. 2020

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“…[ 5,22,25–28 ] A dramatic RI sensitivity increase, however, can be found in the gas regime from a typical value of ≈300 nm RIU −1 to (4–30)×10 3 nm RIU −1 after UV processing, [ 25 ] which has been utilized in detecting CO 2 and CH 4 via monitoring the changes in permittivity of carbon nanotubes and zinc oxide, respectively, due to oxidization/reduction chemical reactions. [ 25,28 ] An example of our plasmonic sensing platform operating in the gas regime, after UV processing, is shown in Figure 4g,h using the alkane gases. This yields typical sensitivity values of 11 × 10 3 and 5.5 × 10 3 dB RIU −1 with spectral noise having a standard deviation of Δ λ error = 0.12 nm and 0.1 dB.…”

Section: Resultsmentioning

confidence: 99%

Generation of a Conjoint Surface Plasmon by an Infrared Nano‐Antenna Array

Allsop

Mou

Neal

et al. 2020

Advanced Photonics Research

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Localized surface plasmons (LSP) excited by optical fields have many potential applications resulting from their ability in detecting ultra‐small, ambient refractive index change. Current methods using surface nano‐patterning by means of lithography have given rise to LSP of limited propagation and interaction lengths, meaning that practical applications remain challenging. This article describes a new all‐optical method of generating LSP by means of a carefully fabricated low‐dimensional nano‐structured material using a direct‐write photochemical lithography. It is shown that the resulting array of localized SPs combine or “Conjoin” to have an unprecedented large interaction length, via coupled evanescent fields, giving rise to superior spectral sensitivities; several orders of magnitude better than those quoted elsewhere and reaching 6 × 103 nm RIU−1 in the aqueous regime and 104 nm RIU−1 in the gaseous regime. Numerical modeling is performed that shows this design of plasmonic platform is capable of producing sensitivities of 105–106 nm RIU−1. It is believed the results achieved in this investigation show that a unique conjoint SP operational mode will significantly impact areas of interest, such as single molecular dynamics, drug delivery systems, etc.

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“…This mixed potential sensor was applied in the detection of unburnt methane in natural gas. Allsop et al [17] studied the wavelength shift in a multilayered structure of Pt-ZnO in the presence of CH 4 exhibiting a volume limit of detection of 2% (20,000 ppm) methane resulting in the possibility of optical sensing of CH 4 to cater for safety concerns. In terms of biomedical applications, CH 4 levels in breath can be measured using the commercial BreathTracker Analyzer (Quintron Instruments).…”

Section: Introductionmentioning

confidence: 99%

Co-doped ZnO Nanowires for Low Temperature Methane Sensing Operational in Humid Environments

Morrin¹,

Datta²

2020

Preprint

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<p>Sensitive and selective detection of methane is essential due to its role in the greenhouse effect, relevance to industrial safety and recently discovered importance as a biomarker for gastrointestinal health. However, obtaining a reliable response to low concentrations (<100 ppm) of methane at low temperatures, especially in presence of humidity still remains a great challenge. In this work, a metal-oxide based sensor capable of low methane concentration detection and humidity resistance is reported. Chemiresistive sensors based on ZnO nanowire films were grown by a hydrothermal process and doped with Co. In terms of methane detection, Co-doping of the ZnO nanowires enabled the sensor to operate optimally at the low operating temperature of 50<sup>o</sup>C and an improved sensitivity of response (lowest measured concentration: 1 ppm) was observed when compared to that of pure ZnO nanowire films. This increased sensitivity was attributed to an increase in donor-type vacancies and enhanced oxygen adsorption on the surface. A mesoporous silica molecular sieve was further integrated as a moisture filter layer to mitigate the effect of humidity. It is envisaged that based on the sensors’ performance characteristics reported here, that the sensor could be applicable for emerging diagnostic applications tracking methane emissions from the breath. </p>

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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

Cited by 11 publications

References 31 publications

Detection of nitrous oxide using infrared optical plasmonics coupled with carbon nanotubes

Detection of nitrous oxide using infrared optical plasmonics coupled with carbon nanotubes

Generation of a Conjoint Surface Plasmon by an Infrared Nano‐Antenna Array

Co-doped ZnO Nanowires for Low Temperature Methane Sensing Operational in Humid Environments

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