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Article

Effects of Calcination Temperature on CO-Sensing Mechanism for NiO-Based Gas Sensors

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 Editor: Simonetta Capone
Chemosensors 2022, 10(5), 191; https://doi.org/10.3390/chemosensors10050191
Received: 13 April 2022 / Revised: 12 May 2022 / Accepted: 16 May 2022 / Published: 19 May 2022
NiO-sensitive materials have been synthesized via the hydrothermal synthesis route and calcined in air at 400 °C and, alternatively, at 500 °C. Structural, morphological, and spectroscopic investigations were involved. As such, the XRD patterns showed a higher crystallinity degree for the NiO calcined at 500 °C. Such an aspect is in line with the XPS data indicating a lower surface hydroxylation relative to NiO calcined at 400 °C. An HRTEM microstructural investigation revealed that the two samples differ essentially at the morphological level, having different sizes of the crystalline nanoparticles, different density of the surface defects, and preferential faceting according to the main crystallographic planes. In order to identify their specific gas-sensing mechanism towards CO exposure under the in-field atmosphere, the simultaneous evaluation of the electrical resistance and contact potential difference was carried out. The results allowed the decoupling of the water physisorption from the chemisorption of the ambient oxygen species. Thus, the specific CO interaction mechanism induced by the calcination temperature of NiO has been highlighted. View Full-Text
Keywords: calcination temperature; sensing mechanism towards carbon monoxide; in-field atmosphere calcination temperature; sensing mechanism towards carbon monoxide; in-field atmosphere
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MDPI and ACS Style

Stanoiu, A.; Ghica, C.; Mihalcea, C.G.; Ghica, D.; Somacescu, S.; Florea, O.G.; Simion, C.E. Effects of Calcination Temperature on CO-Sensing Mechanism for NiO-Based Gas Sensors. Chemosensors 2022, 10, 191. https://doi.org/10.3390/chemosensors10050191

AMA Style

Stanoiu A, Ghica C, Mihalcea CG, Ghica D, Somacescu S, Florea OG, Simion CE. Effects of Calcination Temperature on CO-Sensing Mechanism for NiO-Based Gas Sensors. Chemosensors. 2022; 10(5):191. https://doi.org/10.3390/chemosensors10050191

Chicago/Turabian Style

Stanoiu, Adelina, Corneliu Ghica, Catalina G. Mihalcea, Daniela Ghica, Simona Somacescu, Ovidiu G. Florea, and Cristian E. Simion. 2022. "Effects of Calcination Temperature on CO-Sensing Mechanism for NiO-Based Gas Sensors" Chemosensors 10, no. 5: 191. https://doi.org/10.3390/chemosensors10050191

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