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Issue 17, 2016
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Synthesis, characterization and DFT studies of zinc-doped copper oxide nanocrystals for gas sensing applications

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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 °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 H2, 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 H2 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.

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

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Publication details

The article was received on 14 Feb 2016, accepted on 06 Apr 2016 and first published on 07 Apr 2016


Article type: Paper
DOI: 10.1039/C6TA01355D
Citation: J. Mater. Chem. A, 2016,4, 6527-6539
  • Open access: Creative Commons BY license
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    Synthesis, characterization and DFT studies of zinc-doped copper oxide nanocrystals for gas sensing applications

    V. Cretu, V. Postica, A. K. Mishra, M. Hoppe, I. Tiginyanu, Y. K. Mishra, L. Chow, N. H. de Leeuw, R. Adelung and O. Lupan, J. Mater. Chem. A, 2016, 4, 6527
    DOI: 10.1039/C6TA01355D

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