Synthesis of quantum size ZnO crystals and their gas sensing properties for NO2
Synthesis of quantum size ZnO crystals and their gas sensing properties for NO2
复制标题
量子尺寸ZnO晶体的合成及其对NO2的气敏性能
DOI：
10.1016/j.snb.2011.06.056
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发表时间：
2011-11-28
影响因子：
8.4
通讯作者：
Chung Chiun Liu
中科院分区：
文献类型：
--
作者：
Bai Shouli;Chen Liangyuan;Chung Chiun Liu
用室温溶胶凝胶法成功地合成了量子尺寸的氧化锌晶体。采用油酸(OA)作为包覆剂来控制氧化锌的粒径。用X射线衍射仪和透射电子显微镜对氧化锌的晶体结构和尺寸进行了表征。X射线衍射结果表明，所合成的氧化锌为六方纤锌矿结构，平均微晶尺寸为5.7 nm，略小于透射电子显微镜的结果。光致发光(PL)和拉曼光谱表明，量子尺寸的氧化锌保持了体相的晶体结构，表面缺陷较多。在290℃的工作温度下，量子尺寸的氧化锌对NO2的响应度最高，为280，对CO和CH4的选择性最高，分别为31和49。研究了焙烧温度对氧化锌传感器传感性能和暂态响应的影响。(C)2011爱思唯尔B.V.保留所有权利。
Quantum size ZnO crystals have been synthesized successfully by a room temperature sol-gel process. Oleic acid (OA) has been used as capping agent to control the particle size of ZnO. The crystal structure and size of the ZnO are characterized by the X-ray diffraction (XRD) and transmission electron microscope (TEM). The XRD results show the as-synthesized ZnO has hexagonal wurtzite structure and the average crystallite size is 5.7 nm which is little less than TEM result. It is testified by photoluminescence (PL) and Raman spectra that the quantum size ZnO keeps the crystal structure of the bulk ZnO and possesses more surface defects. The quantum size ZnO has the highest response of 280 to NO2 and the highest selectivity of 31 and 49 corresponding to CO and CH4 at operating temperature of 290 degrees C. The effect of calcination temperatures on sensing property and transient response of the ZnO sensor are also investigated. (C) 2011 Elsevier B.V. All rights reserved.