Template-free to fabricate highly sensitive and selective acetone gas sensor based on WO3 microspheres
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 °C for 3 h. The sample was characterized by X-ray diffraction (XRD), energy dispersive spectrum (EDS), scanning electronic microscopy (SEM), tra...
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Veröffentlicht in: | Vacuum 2013-09, Vol.95, p.30-34 |
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Sprache: | eng |
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Zusammenfassung: | 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 °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 ∼1 μm with orthorhombic phase. The WO3 microspheres are constructed of polycrystalline WO3 nanoparticles. The thickness of the WO3 coating of the gas sensor is ∼2 μm. The WO3-based gas sensor exhibited a good sensitivity and high selectivity to acetone vapor at 200 °C. A possible mechanism for the acetone vapor gas sensing was proposed.
► Template-free to fabricate WO3 microspheres. ► Orthorhombic phase. ► Quick response. ► WO3 based sensor exhibited a good sense to acetone vapor. |
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ISSN: | 0042-207X 1879-2715 |
DOI: | 10.1016/j.vacuum.2013.02.005 |