期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 250, 期 -, 页码 692-702出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2017.04.099
关键词
CdO/ZnO composites; Hollow microspheres; n-n Heterojunction; Gas sensors; Low detection limit
资金
- National Nature Science Foundation of China [61520106003, 61503148, 61327804, 61374218, 61134010]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT13018]
- National High Tech Research and Development Program of China (863 Program) [2013AA030902, 2014AA06A505]
- China Postdoctoral Science Foundation [2015M580247]
- National Key Research and Development Program [2016YFC0207300]
CdO decorated flower-like ZnO hollow microspheres were successfully prepared via a two-step hydrothermal strategy. CdO nanoparticles (similar to 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-omicron, which was about 16 folder higher than that of pure ZnO at the same operating temperature of 250 C-omicron. 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. (C) 2017 Published by Elsevier B.V.
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