Journal
VACUUM
Volume 95, Issue -, Pages 30-34Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2013.02.005
Keywords
Tungsten trioxide (WO3); Microspheres; Acetone vapor; Gas-sensor
Funding
- National Natural Science Foundation of China [50842027, 61106125]
- National Science Foundation of Henan Province [102300410165, 2010B150028]
- Henan Province of International Science & Technology Cooperation [124300510054]
- Foundation of Xuchang University [2013062]
- Program for Science & Technology of Henan Province [122102210419, 122300410005]
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In this paper, we described how WO3 microspheres have been synthesized by a simple hydrothermal treatment from the precursor of Na2WO4 and CO (NH2)(2) at 160 degrees C for 3 h. The sample was characterized by X-ray diffraction (XRD), energy dispersive spectrum (EDS), scanning electronic microscopy (SEM), transmission electronic microscopy (TEM), high resolution transmission electronic microscopy (HRTEM), selected area electron diffraction (SAED), and X-ray photoelectron spectroscopy (XPS). Obtained results indicated that the average diameter of the as-prepared WO3 microspheres is similar to 1 mu m with orthorhombic phase. The WO3 microspheres are constructed of polycrystalline WO3 nanoparticles. The thickness of the WO3 coating of the gas sensor is similar to 2 mu m. The WO3-based gas sensor exhibited a good sensitivity and high selectivity to acetone vapor at 200 degrees C. A possible mechanism for the acetone vapor gas sensing was proposed. (C) 2013 Elsevier Ltd. All rights reserved.
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