Isopropanol sensing properties of coral-like ZnO-CdO composites by flash preparation via self-sustained decomposition of metalorganic complexes
Isopropanol sensing properties of coral-like ZnO-CdO composites by flash preparation via self-sustained decomposition of metalorganic complexes
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DOI：
10.1016/j.snb.2014.03.093
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发表时间：
2014-07-01
影响因子：
8.4
通讯作者：
Wang, Yude
中科院分区：
文献类型：
--
作者：
Cai, Xiaoyan;Hu, Dan;Wang, Yude
通过金属-有机配合物的自持续分解，快速制备了具有三维分层多孔结构的珊瑚状ZnO-CdO复合材料。用x射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和x射线光电子能谱（XPS）对所得材料的物相和形貌进行了表征。结果表明，ZnCd复合材料具有数十微米大小的珊瑚状结构，并具有分层多孔结构，其中大孔壁含有较小的介孔。三维层次结构由纳米颗粒组成。研究了所制备的ZnO-CdO多孔异丙醇复合材料的气敏特性。采用多孔ZnO-CdO复合材料作为敏感材料，在带有自电极和铂丝的氧化铝管上制备了间接加热传感器。所有的测量都是在175 ~ 315℃的几个工作温度下进行的，所制备的含10 % CdO （ZnCd10）的多孔ZnO-CdO复合材料样品对异丙醇具有良好的气敏性能。结果表明，该传感器在248℃的工作温度下具有最高的气体响应和选择性，是异丙醇实用探测器的理想选择。(C) 2014 Elsevier B.V.版权所有
The coral-like ZnO-CdO composites with the 3D hierarchical porous structure were prepared in a facileflash from self- sustained decomposition of a metal- organic complex. The phases and the morphologiesof the resulting materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectrum (XPS), respectively. The results showed that the ZnCd composites have a coral- like shape with a size of tens of micrometersand exhibit the hierarchically porous morphology, in which the walls of the macropores contain smallermesopores. The 3D hierarchical architecture consisted of nanoparticles. The gas-sensing characteristicsof the resulted porous ZnO-CdO composites for isopropanol were investigated. Indirect- heating sensorsusing porous ZnO-CdO composites as sensitive materials were fabricated on an alumina tube with Auelectrodes and platinum wires. All measurements were performed at several operating temperaturesfrom 175 to 315 degrees C. Good gas-sensing performances to isopropanol have been found for the preparedsample of porous ZnO-CdO composite with a content of 10 at% CdO (ZnCd10). It is shown that the sensorexhibits the highest gas response and selectivity at the operating temperature of 248 degrees C, making thempromising candidates as practical detectors for isopropanol. (C) 2014 Elsevier B.V. All rights reserved.