Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 160, Issue 1, Pages 364-370Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2011.07.062
Keywords
Homogeneous precipitation; ZnO micro-octahedron; Gas sensor; Formaldehyde; Defect; Oxygen species
Funding
- Chinese Academy of Sciences
- Ministry of Science and Technology, PR China [2008BWZ009]
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Nanoparticle-assembled ZnO micro-octahedrons were synthesized by a facile homogeneous precipitation method. The ZnO micro-octahedrons are hexagonal wurtzite with high crystallinity. Abundant structure defects were confirmed on ZnO surface by photoluminescence. Gas sensors based on the ZnO micro-octahedrons exhibited high response, selectivity and stability to 1-1000 ppm formaldehyde at 400 degrees C. Especially, even 1 ppm formaldehyde could be detected with high response (S = 22.7). It is of interest to point out that formaldehyde could be easily distinguished from ethanol or acetaldehyde with a selectivity of about 3. The high formaldehyde response is mainly attributed to the synergistic effect of high contents of electron donor defects (Zn-i and V-o) and highly active oxygen species (O2-) on the ZnO surface. (C) 2011 Elsevier B.V. All rights reserved.
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