Flower-like ZnO hollow microspheres loaded with CdO nanoparticles as high performance sensing material for gas sensors
Flower-like ZnO hollow microspheres loaded with CdO nanoparticles as high performance sensing material for gas sensors
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负载CdO纳米粒子的花状ZnO空心微球作为气体传感器的高性能传感材料
DOI：
10.1016/j.snb.2017.04.099
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发表时间：
2017-10
影响因子：
8.4
通讯作者：
Lu Geyu
中科院分区：
文献类型：
--
作者：
Wang Tianshuang;Kou Xueying;Zhao Liupeng;Sun Peng;Liu Chang;Wang Yue;Shimanoe Kengo;Yarnazoe Noboru;Lu Geyu
采用两步法成功制备了CdO修饰的花状ZnO空心微球。从扫描电镜（SEM）和透射电镜（TEM）可以清楚地观察到，CdO纳米颗粒（~ 12 nm）均匀地负载在ZnO纳米片表面。x射线光电子能谱和h2程序升温还原（H2-TPR）结果表明，引入CdO纳米颗粒后，化学吸附氧的量增加。与花状ZnO空心微球相比，2.6 mol% CdO:ZnO异质结构复合材料在250℃下对100 ppm乙醇的响应最高（65.5），比250℃下纯ZnO的响应高约16倍。值得注意的是，2.6 mol% CdO:ZnO异质结构的检出限可达ppb级（500 ppb）。系统地讨论了乙醇传感增强的机理。
CdO decorated flower-like ZnO hollow microspheres were successfully prepared via a two-step hydrothermal strategy. CdO nanoparticles (∼12 nm) equably loaded on the surfaces of ZnO nanosheets, which could be clearly observed from SEM and TEM images. The results of X-ray photoelectron spectroscopy and H2temperature-programmed reduction (H2-TPR) indicated that the amount of chemisorbed oxygen was increased after the introduction of CdO nanoparticles. Compared with the flower-like ZnO hollow microspheres, the 2.6 mol% CdO:ZnO heterostructure composites exhibited highest response (65.5) to 100 ppm ethanol at 250 °C, which was about 16 folder higher than that of pure ZnO at the same operating temperature of 250 °C. Significantly, the detection limit of the 2.6 mol% CdO:ZnO heterostructure could reach ppb level (500 ppb). The mechanism of the enhanced ethanol sensing was also discussed systematically.
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