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Effective reduced graphene oxide sheets/hierarchical flower-like NiO composites for methanol sensing under high humidity

Abstract

Recent advances on NiO-based gas sensors have been reported, but high working temperatures and dry conditions are usually required. Herein, we report the volatile organic compounds (VOCs) sensing performance of flower-like (FL) NiO hierarchical structure modified with reduced graphene oxide (RGO) sheets under high humidity condition. RGO/FL-NiO composites were synthesized by a simple and template-free microwave-assisted hydrothermal method and subsequent calcination at 250 °C. The VOC-sensing properties were investigated for several VOCs, such as acetone, ethanol, methanol, m-xylene, and toluene, at 90% relative humidity. The RGO/FL-NiO composites exhibited a decrease in the optimal operating temperature and enhanced methanol responses compared to pure FL-NiO. In addition, 5% RGO/FL-NiO composite exhibited the highest response of 61.51% to 100 ppm of methanol at 180 °C, which was 1.4–9.9 times superior to that of other VOCs, indicating the great sensor’s selectivity. The improved methanol sensing properties could be attributed to the NiO/RGO heterointerface.

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Publication details

The article was received on 05 Mar 2018, accepted on 13 Apr 2018 and first published on 13 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ01061G
Citation: New J. Chem., 2018, Accepted Manuscript
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    Effective reduced graphene oxide sheets/hierarchical flower-like NiO composites for methanol sensing under high humidity

    C. D. A. Zito, T. M. Perfecto, C. D. S. Fonseca and D. P. Volanti, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ01061G

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