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Article

Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity

1
National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
2
Faculty of Physics, University of Bucharest, Atomistilor 405, 077125 Magurele, Romania
3
“Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, Spl. Independentei 202, 060021 Bucharest, Romania
*
Author to whom correspondence should be addressed.
Academic Editors: Xianghong Liu and Nicola Donato
Chemosensors 2021, 9(9), 244; https://doi.org/10.3390/chemosensors9090244
Received: 11 August 2021 / Revised: 26 August 2021 / Accepted: 29 August 2021 / Published: 1 September 2021
(This article belongs to the Special Issue Emerging Applications of Gas Sensors Based on Metal Oxides)
Polycrystalline NiO thick film-based gas sensors have been exposed to different test gas atmospheres at 250 °C and measured via simultaneous electrical resistance and work function investigations. Accordingly, we decoupled different features manifested toward the potential changes, i.e., work function, band-bending, and electron affinity. The experimental results have shown that the presence of moisture induces an unusual behavior toward carbon monoxide (CO) detection by considering different surface adsorption sites. On this basis, we derived an appropriate detection mechanism capable of explaining the lack of moisture influence over the CO detection with NiO-sensitive materials. As such, CO might have both chemical and dipolar interactions with pre-adsorbed or lattice oxygen species, thus canceling out the effect of moisture. Additionally, morphology, structure, and surface chemistry were addressed, and the results have been linked to the sensing properties envisaging the role played by the porous quasispherical–hollow structures and surface hydration. View Full-Text
Keywords: thick films nickel oxide; electrical resistance and work function investigations; band-bending and electron affinity behavior; carbon monoxide detection mechanism thick films nickel oxide; electrical resistance and work function investigations; band-bending and electron affinity behavior; carbon monoxide detection mechanism
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MDPI and ACS Style

Simion, C.E.; Ghica, C.; Mihalcea, C.G.; Ghica, D.; Mercioniu, I.; Somacescu, S.; Florea, O.G.; Stanoiu, A. Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity. Chemosensors 2021, 9, 244. https://doi.org/10.3390/chemosensors9090244

AMA Style

Simion CE, Ghica C, Mihalcea CG, Ghica D, Mercioniu I, Somacescu S, Florea OG, Stanoiu A. Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity. Chemosensors. 2021; 9(9):244. https://doi.org/10.3390/chemosensors9090244

Chicago/Turabian Style

Simion, Cristian E., Corneliu Ghica, Catalina G. Mihalcea, Daniela Ghica, Ionel Mercioniu, Simona Somacescu, Ovidiu G. Florea, and Adelina Stanoiu. 2021. "Insights about CO Gas-Sensing Mechanism with NiO-Based Gas Sensors—The Influence of Humidity" Chemosensors 9, no. 9: 244. https://doi.org/10.3390/chemosensors9090244

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