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Author Bai, Shouli ♦ Chen, Chao ♦ Tian, Ye ♦ Chen, Song ♦ Luo, Ruixian ♦ Li, Dianqing ♦ Chen, Aifan ♦ Liu, Chung Chiun
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword NANOSCIENCE AND NANOTECHNOLOGY ♦ CARBON MONOXIDE ♦ DEFECTS ♦ HYDROTHERMAL SYNTHESIS ♦ MOLYBDENUM OXIDES ♦ NANOSTRUCTURES ♦ ORTHORHOMBIC LATTICES ♦ PHOTOLUMINESCENCE ♦ SCANNING ELECTRON MICROSCOPY ♦ SEMICONDUCTOR MATERIALS ♦ SENSORS ♦ STOICHIOMETRY ♦ SURFACTANTS ♦ TEMPERATURE RANGE 0273-0400 K ♦ X-RAY DIFFRACTION ♦ X-RAY PHOTOELECTRON SPECTROSCOPY
Abstract Highlights: • α-MoO{sub 3} nanorods were synthesized by facile hydrothermal method at 85 °C for 1.5 h. • α-MoO{sub 3} nanorods exhibit the highest sensitivity of 239.6–40 ppm CO at 292 °C. • XPS and PL confirmed that the gas sensing arises from stoichiometric defect of α-MoO{sub 3}. • The sensing mechanism of α-MoO{sub 3} to CO was postulated from bulk defect of material. - Abstract: Orthorhombic molybdenum trioxide (α-MoO{sub 3}) nanorods with well-defined morphology and high crystalline have been synthesized by a facile and fast hydrothermal method under 85 °C for 1.5 h without employing surfactants or templates. The controlling of stirring time, thermostatic time and HNO{sub 3} amount is crucial for the growth of α-MoO{sub 3} nanorods. The morphology and structure of α-MoO{sub 3} were characterized by field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The obtained α-MoO{sub 3} nanorods as a novel sensing material exhibit high sensitivity, the highest response to 40 ppm CO is 239.6 at operating temperature of 292 °C. The intrinsic sensing performance arises from the non-stoichiometry of the α-MoO{sub 3} due to the presence of Mo{sup 5+} in MoO{sub 3} lattice, that is, the molecular formula of MoO{sub 3} should be expressed as MoO{sub 3−x} (x = 0.08), which has been confirmed by X-ray photoelectron spectroscopic (XPS) analysis and room temperature photoluminescence (PL). The sensing mechanism of α-MoO{sub 3} to CO was also discussed in terms of lattice oxygen in MoO{sub 3}.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-04-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 64


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