Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 150, Issue 1, Pages 339-345Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2010.06.063
Keywords
Tungsten oxide; Nanowires; Nanosheets; Solvothermal synthesis; Gas sensors
Funding
- National Natural Science Foundation [60801018, 60771019]
- Tianjin Natural Science Foundation [09JCYBJC01100]
- New Teacher Foundation of Ministry of Education of China [200800561109]
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Nanowires and nanosheets of tungsten oxide were synthesized by solvothermal method with different tungsten hexachloride (WCl6) concentrations in 1-propanol solvent. The morphology and crystal structure of the tungsten oxide nanostructures were investigated by means of field emission scanning electron microscope, X-ray diffraction and transmission electron microscope. The specific surface area and pore size distribution were characterized by Brunauer-Emmett-Teller gas-sorption measurements. One-dimensional W18O49 nanowire bundles were synthesized at the WCl6 concentration of 0 01 M. With the concentration increasing to 0.02 M, the structure of the pure two-dimensional WO3 nanosheets was formed. The NO2 gas sensing properties of W18O49 nanowires and WO3 nanosheets were investigated at 100 degrees C up to 250 degrees C over NO2 concentration ranging from 1 to 20 ppm. Both nanowires and nanosheets exhibit reversible response to NO2 gas at different concentrations In comparison to WO3 nanosheets, W18O49 nanowire bundles showed a much higher response value and faster response-recovery characteristics to NO2 gas, especially a much quicker response characteristic with response time of 19s at the concentration of 5 ppm. (C) 2010 Elsevier B.V. All rights reserved
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