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Sensors 2013, 13(5), 6171-6182; doi:10.3390/s130506171
Article

Hydrothermal Synthesis of Various Hierarchical ZnO Nanostructures and Their Methane Sensing Properties

1,* , 1,* , 1
 and 2
Received: 21 March 2013; in revised form: 23 April 2013 / Accepted: 26 April 2013 / Published: 10 May 2013
(This article belongs to the Special Issue Nanotube and Nanowire Sensors)
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Abstract: 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.
Keywords: hierarchical nanostructures; ZnO gas sensor; growth mechanism; methane; sensing properties hierarchical nanostructures; ZnO gas sensor; growth mechanism; methane; sensing properties
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Zhou, Q.; Chen, W.; Xu, L.; Peng, S. Hydrothermal Synthesis of Various Hierarchical ZnO Nanostructures and Their Methane Sensing Properties. Sensors 2013, 13, 6171-6182.

AMA Style

Zhou Q, Chen W, Xu L, Peng S. Hydrothermal Synthesis of Various Hierarchical ZnO Nanostructures and Their Methane Sensing Properties. Sensors. 2013; 13(5):6171-6182.

Chicago/Turabian Style

Zhou, Qu; Chen, Weigen; Xu, Lingna; Peng, Shudi. 2013. "Hydrothermal Synthesis of Various Hierarchical ZnO Nanostructures and Their Methane Sensing Properties." Sensors 13, no. 5: 6171-6182.



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