Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 173, Issue -, Pages 426-432Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.07.029
Keywords
Tungsten oxide; NO2 gas sensor; Hollow microspheres; Hierarchical structures
Funding
- Natural Science Foundation of PR China [61006055, 61074172, 61134010]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT1017]
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The nanosheets assembled hierarchical WO3 hollow microspheres were successfully synthesized by sintering acid-treated CaWO4 hollow microspheres precursor at 500 degrees C. The as-obtained sample was characterized with field emission scanning electron microscopy, X-ray powder diffraction, transmission electron microscopy, and nitrogen adsorption and desorption measurements. The results indicated that the as-prepared product was monoclinic tungsten oxide and the nanosheet was single crystal and had a large amount of surface defects. The as-obtained sample had porous structures with a wide range of pore size distributions from 1 nm to 170 nm. The sensor based on this hierarchical structures exhibited excellent sensing properties to nitrogen dioxide (NO2) at relatively low operating temperature, and the response to 40 ppb NO2 is about 16 at 75 degrees C. The nanosheets assembled hierarchical WO3 hollow microspheres might have potential application to fabricate highly sensitive and low power consumption NO2 gas sensor. (c) 2012 Elsevier B.V. All rights reserved.
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