Facile synthesis of α-MoO{sub 3} nanorods with high sensitivity to CO and intrinsic sensing performance

Journal Article · Wed Apr 15 00:00:00 EDT 2015 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.12.049· OSTI ID:22475734

Bai, Shouli; Chen, Chao; Tian, Ye; Chen, Song; Luo, Ruixian; Li, Dianqing ^[1]; Chen, Aifan ^[1]; Liu, Chung Chiun ^[2]

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1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029 (China)
2. Department of Chemical Engineering, Case Western Reserve University, Cleveland, OH 44106 (United States)

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}.

• OSTI ID: 22475734
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 64; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

77 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