Journal
NEW JOURNAL OF CHEMISTRY
Volume 42, Issue 11, Pages 8638-8645Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nj01061g
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Funding
- Sao Paulo Research Foundation - FAPESP [2017/01267-1, 2016/25267-8, 2016/04371-1, 2013/23886-4]
- National Council for Scientific and Technological Development - CNPq [444926/2014-3]
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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 degrees 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 degrees 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.
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