期刊
CERAMICS INTERNATIONAL
卷 38, 期 2, 页码 1643-1647出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2011.09.055
关键词
Powders: chemical preparation; ZnO; Sensors
资金
- High-Tech Project of Xinjiang Province [200915124]
Flower-like 3D ZnO microstructures constructed from nanorods of different sizes were prepared by a microwave hydrothermal (MH) process in the presence of o-, m- and p-nitrobenzoic acid, respectively. Well-crystallized flower-like ZnO microstructures were obtained after 10 min MH treatment. The X-ray powder diffraction (XRD) test indicated that all the products were consistent with the hexagonal ZnO phase, and scanning electron microscopy (SEM) investigation revealed that the flower-like 3D ZnO microstructures were built with sword-like nanorods 60-100 nm in width and several micrometers in length. The formation mechanism of these flower-like 3D ZnO microstructures is discussed briefly. The gas sensitivity of the as-prepared ZnO microstructures to ethanol at different operation temperatures and concentrations was also studied. The results indicated that the gas sensitivity of the ZnO microstructures was influenced by the particle size and microcosmic configuration, the larger particles with crowded nanorods having higher gas sensitivity. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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