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Issue 11, 2018
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Effective reduced graphene oxide sheets/hierarchical flower-like NiO composites for methanol sensing under high humidity

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Abstract

Recent advances in NiO-based gas sensors have been reported, but high working temperatures and dry conditions are usually required. Herein, we report the volatile organic compound (VOC) sensing performance of flower-like (FL) NiO hierarchical structures modified with reduced graphene oxide (RGO) sheets under high humidity. 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, the 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 responses to other VOCs, indicating the sensor's great selectivity. The improved methanol sensing properties could be attributed to the NiO/RGO heterointerface.

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

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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., 2018,42, 8638-8645
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    Effective reduced graphene oxide sheets/hierarchical flower-like NiO composites for methanol sensing under high humidity

    C. A. Zito, T. M. Perfecto, C. S. Fonseca and D. P. Volanti, New J. Chem., 2018, 42, 8638
    DOI: 10.1039/C8NJ01061G

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