期刊
SENSORS
卷 13, 期 5, 页码 6171-6182出版社
MDPI
DOI: 10.3390/s130506171
关键词
hierarchical nanostructures; ZnO gas sensor; growth mechanism; methane; sensing properties
资金
- National Natural Science Foundation of China [51277185, 51202302]
- Funds for Innovative Research Groups of China [51021005]
- China Postdoctoral Science Foundation [2012M511904]
Hierarchical flower-like ZnO nanorods, net-like ZnO nanofibers and ZnO nanobulks have been successfully synthesized via a surfactant assisted hydrothemal method. The synthesized products were characterized by X-ray powder diffraction and field emission scanning electron microscopy, respectively. A possible growth mechanism of the various hierarchical ZnO nanostructures is discussed in detail. Gas sensors based on the as-prepared ZnO nanostructures were fabricated by screen-printing on a flat ceramic substrate. Furthermore, their gas sensing characteristics towards methane were systematically investigated. Methane is an important characteristic hydrocarbon contaminant found dissolved in power transformer oil as a result of faults. We find that the hierarchical flower-like ZnO nanorods and net-like ZnO nanofibers samples show higher gas response and lower operating temperature with rapid response-recovery time compared to those of sensors based on ZnO nanobulks. These results present a feasible way of exploring high performance sensing materials for on-site detection of characteristic fault gases dissolved in transformer oil.
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