Fabrication of novel hierarchical ZnO via ultrasonic assisted hydrothermal route and their gas sensing property
Fabrication of novel hierarchical ZnO via ultrasonic assisted hydrothermal route and their gas sensing property
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DOI：
10.1007/s10854-013-1267-2
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发表时间：
2013-06
期刊：
影响因子：
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通讯作者：
Jianjiao Zhang;E. Guo;H. Yue;L. Wang;Chunyu Zhang;Chang Jing;Xin Gao
中科院分区：
文献类型：
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作者：
Jianjiao Zhang;E. Guo;H. Yue;L. Wang;Chunyu Zhang;Chang Jing;Xin Gao
采用超声辅助水热法成功地合成了具有城堡状和塔形形貌的新型分级结构ZnO纳米材料。采用扫描电镜和X射线衍射对产物的形貌和结构进行了表征。结果表明：所制备的蜂窝状ZnO微米棒具有六等轴对称特征，长度为2-4 μm，直径约为1 μm; ZnO具有自由基分支结构，直径为500 ~ 700 nm，形貌为塔形。结果表明，溶液的初始碱浓度对水热过程中ZnO晶体的两种分级形貌的形成起着决定性的作用。并提出了蜂窝状和塔状ZnO微结构的可能形成机制。分级ZnO的不同气体的气敏也进行了研究。实验结果表明，该陀螺状ZnO传感器对乙醇气体具有快速响应特性和良好的选择分辨能力。
Novel hierarchical ZnO nanomaterials with castellated and turriform morphologies were successfully synthesized by ultrasonic assisted hydrothermal route. The morphology and structure of products were characterized by scanning electron microscopy and X-ray diffraction, respectively. The results show that as-prepared castellated ZnO microrods have six-equal axis symmetry features with the length of 2–4 μm and the diameter of about 1 μm, and ZnO with turriform morphology has radical branch structure with the diameter ranging from 500 to 700 nm. It is found that initial alkaline concentration of the solution plays a crucial role in determining two kinds of hierarchical morphologies by etching ZnO crystal during hydrothermal process. A possible formation mechanism of castellated and turriform ZnO microstructures is also proposed. Gas sensing of hierarchical ZnO to different gases was also examined. The result indicates turriform ZnO sensor has fast response properties and excellent selective resolution capability to C2H5OH gas.