Underpinning the Interaction between NO 2 and CuO Nanoplatelets at Room Temperature by Tailoring Synthesis Reaction Base and Time.

Autor: Oosthuizen DN; Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein ZA9300, South Africa.; DST/CSIR National Centre for Nano-Structured Materials, Council for Scientific Industrial Research, Pretoria 0001, South Africa., Motaung DE; Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein ZA9300, South Africa.; Department of Physics, University of Limpopo, Private Bag X1106, Sovenga 0727, South Africa., Strydom AM; Highly Correlated Matter Research Group, Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa., Swart HC; Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein ZA9300, South Africa.
Jazyk: angličtina
Zdroj: ACS omega [ACS Omega] 2019 Oct 23; Vol. 4 (19), pp. 18035-18048. Date of Electronic Publication: 2019 Oct 23 (Print Publication: 2019).
DOI: 10.1021/acsomega.9b01882
Abstrakt: An approach to tailor the morphology and sensing characteristics of CuO nanoplatelets for selective detection of NO 2 gas is of great significance and an important step toward achieving the challenge of improving air quality and in assuring the safety of mining operations. As a result, in this study, we report on the NO 2 room temperature gas-sensing characteristics of CuO nanoplatelets and the underlying mechanism toward the gas-sensing performance by altering the synthesis reaction base and time. High sensitivity of ∼40 ppm -1 to NO 2 gas at room temperature has been realized for gas sensors fabricated from CuO nanoplatelets, using NaOH as base for reaction times of 45 and 60 min, respectively at 75 °C. In both cases, the crystallite size, surface area, and hole concentration of the respective materials influenced the selectivity and sensitivity of the NO 2 gas sensors. The mechanism underpinning the superior NO 2 gas sensing are thoroughly discussed in terms of the crystallite size, hole concentration, and surface area as active sites for gas adsorption.
Competing Interests: The authors declare no competing financial interest.
(Copyright © 2019 American Chemical Society.)
Databáze: MEDLINE
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