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AACVD synthesis and gas sensing properties of nickel oxide nanoparticle decorated tungsten oxide nanowires

Abstract

Here we show that the aerosol assisted chemical vapor deposition process is suitable for growing single crystalline tungsten oxide nanowires loaded with nickel oxide nanoparticles. This method allows for achieving a wide range of nickel oxide loading of tungsten oxide nanowires, with high effectivity. It allows also for the direct growth of these nanomaterials onto application substrates for developing resistive metal oxide gas sensors. Different morphological and compositional analysis tools have been employed for the characterization of the nanomaterials, finding that nickel oxide nanoparticles are homogeneously distributed over the tungsten oxide nanowire surface. However, at high Ni loadings, even though nanoparticles keep their size unchanged, they form agglomerates, especially at the tips of tungsten nanowires. The gas sensing properties of the different nanomaterials grown towards methane, ethanol, nitrogen dioxide and hydrogen sulfide have been studied. The optimized loading of tungsten oxide with nickel oxide nanoparticles has a positive effect for increasing the sensitivity and selectivity of the resulting nanomaterial to hydrogen sulfide, reaching a five-fold increase in the response towards this species. This improvement is attributed to combined chemical and electronic sensitization effects. Therefore, these nanomaterials show good potential for developing inexpensive resistive sensors able to monitor the presence of hydrogen sulfide in the ambient.

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Publication details

The article was received on 02 Feb 2018, accepted on 17 Apr 2018 and first published on 17 Apr 2018


Article type: Paper
DOI: 10.1039/C8TC00571K
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    AACVD synthesis and gas sensing properties of nickel oxide nanoparticle decorated tungsten oxide nanowires

    E. Navarrete, C. Bittencourt, P. Umek and E. Llobet, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC00571K

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