A comparative study of porous ZnO nanostructures synthesized from different zinc salts as gas sensor materials
A comparative study of porous ZnO nanostructures synthesized from different zinc salts as gas sensor materials
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DOI：
10.1016/j.jallcom.2013.05.211
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发表时间：
2013-11-25
影响因子：
6.2
通讯作者：
Ma, Xicheng
中科院分区：
文献类型：
--
作者：
Song, Haiyan;Yang, Heng;Ma, Xicheng
用尿素溶液和不同的锌盐(醋酸锌、氯化锌和硫酸锌)在相同条件下通过简单的水热法制备了碱式碳酸锌(BZC)前驱体，并对其进行了热处理。报道了不同的阴离子物种(CH3COO-、Cl-和SO42-)对所制备的多孔氧化锌纳米结构的形貌、结构和气敏性能的影响。用X射线衍射仪、热重-差示扫描量热仪、傅立叶变换红外光谱、扫描电子显微镜、透射电子显微镜和比表面积对产物进行了表征。所有的BZC前驱体都是由Zn-5(CO3)(2)(OH)(6)和Zn4CO3(OH)(6)中心点H2O组成的混合物。热处理后，由硫酸锌制备的多孔氧化锌纳米结构显示出最大的比表面积。相同尺寸选定区域(直径500 nm)的SAED图谱表明，由硫酸锌和氯化锌制备的多孔氧化锌纳米结构通常具有多晶性，而由醋酸锌制备的多孔氧化锌纳米结构通常具有单晶性或准单晶性。研究了这三种多孔氧化锌纳米结构样品对几种典型的挥发性有机化合物(包括丙酮、邻氯苯酚和甲醛等)的气敏性能。进行了全面的调查。由硫酸锌制备的多孔氧化锌纳米结构具有最好的气敏性能，其次是氯化锌和醋酸锌得到的氧化锌样品。这些结果初步归因于多孔氧化锌样品的总比表面积、结晶性质和累积形貌的不同。(C)2013爱思唯尔B.V.保留所有权利。
Three porous ZnO nanostructures were synthesized by annealing their basic zinc carbonate (BZC) precursors, which were prepared via a simple hydrothermal process using urea solution with different zinc salts (zinc acetate, zinc chloride or zinc sulfate) under the same conditions. The influences of different anonic species (CH3COO-, Cl- and SO42-) on the morphologies, structures and gas sensing performances of the obtained porous ZnO nanostructures have been reported. The products were characterized by XRD, TG-DSC, FTIR, SEM, TEM and BET. All the BZC precursors are the mixture of Zn-5(CO3)(2)(OH)(6) and Zn4CO3(OH)(6)center dot H2O. After annealing, porous ZnO nanostructures obtained from zinc sulfate show the largest specific surface areas. SAED patterns of the same size selected area (500 nm in diameter) show that the porous ZnO nanostructures obtained from zinc sulfate and zinc chloride often display polycrystalline nature, while those obtained from zinc acetate often display single or quasi-single crystalline nature. The gas sensing performances of these three porous ZnO nanostructure samples toward some typical volatile organic compounds (including acetone, 2-chlorophenol and formaldehyde, etc.) were investigated comprehensively. The porous ZnO nanostructure obtained from zinc sulfate shows the most superior gas-sensing properties, followed in turn by the ZnO samples obtained from zinc chloride and zinc acetate. The results are tentatively attributed to the different total specific surface area, crystalline nature and accumulated morphologies of the porous ZnO samples. (c) 2013 Elsevier B.V. All rights reserved.