Synthesis, characterization and DFT studies of zinc-doped copper oxide nanocrystals for gas sensing applications.

Cretu, V., Postica, V., Mishra, A. K., Hoppe, M., Tiginyanu, I., Mishra, Y. K., Chow, L., de Leeuw, N. H., Adelung, Rainer and Lupan, O. (2016) Synthesis, characterization and DFT studies of zinc-doped copper oxide nanocrystals for gas sensing applications. Journal of Materials Chemistry A, 4 (17). pp. 6527-6539. DOI 10.1039/C6TA01355D .

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Supplementary data:

Abstract

Due to their unique properties, p-type copper oxide nanostructures have demonstrated promising potential for various applications, especially for the detection of ethanol vapour and other volatile organic compounds (VOCs). In this work a simple and cost-effective synthesis from chemical solutions (SCS) at low temperatures (<= 80 degrees C) and rapid thermal annealing (RTA) process were used to grow zinc-doped copper oxide (ZnxCu1-xOy) nanostructures. The structural, morphological, vibrational, chemical, electronic and sensorial characteristics of ZnxCu1-xOy nanocrystallite layers obtained by using such an efficient approach based on both, the SCS and RTA processes, have been studied. The investigations demonstrated the possibility to tune sensitivity from VOC to H-2, as well as an improved response and high selectivity with respect to hydrogen gas for ZnxCu1-xOy nano-crystalline thin films with x = 0.03. Density functional theory calculations showed that the charge transfer together with changes in the Fermi level facilitate H-2 gas sensing, which is further enhanced by Zn doping. Hydrogen gas sensing with a high response and selectivity using p-type hybrid semiconductor nanostructures has been reported. An improved stability in humid air was observed by exposure of doped samples to rapid thermal annealing process for the first time. The experimental and calculation results provide an alternative to sensitive and selective detection of ethanol and hydrogen gases, which would be of particular benefit in the area of public security, industrial and environmental applications.

Document Type: Article
Additional Information: Times Cited: 10 Cretu, V. Postica, V. Mishra, A. K. Hoppe, M. Tiginyanu, I. Mishra, Y. K. Chow, L. de Leeuw, Nora H. Adelung, R. Lupan, O.
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1039/C6TA01355D
ISSN: 2050-7488
Projects: Future Ocean
Date Deposited: 18 Mar 2017 11:55
Last Modified: 20 May 2019 15:13
URI: http://oceanrep.geomar.de/id/eprint/36039

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