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Flower-like ZnO hollow microspheres loaded with CdO nanoparticles as high performance sensing material for gas sensors.

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Title: Flower-like ZnO hollow microspheres loaded with CdO nanoparticles as high performance sensing material for gas sensors.
Authors: Wang, Tianshuang1, Kou, Xueying1, Zhao, Liupeng1, Sun, Peng1 spmaster2008@163.com, Liu, Chang1,2,3, Wang, Yue2, Shimanoe, Kengo3, Yamazoe, Noboru3, Lu, Geyu1 181306776@qq.com
Source: Sensors & Actuators B: Chemical. Oct2017, Vol. 250, p692-702. 11p.
Subjects: Nanoparticles, Microspheres, Ethanol, Zinc oxide, Cadmium oxide
Abstract: 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 H 2 temperature-programmed reduction (H 2 -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. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract: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 H 2 temperature-programmed reduction (H 2 -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. [ABSTRACT FROM AUTHOR]
ISSN:09254005
DOI:10.1016/j.snb.2017.04.099