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

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 bemore » 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}.« less
Authors:
; ; ; ; ;  [1] ;  [1] ;  [2]
  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)
Publication Date:
OSTI Identifier:
22475734
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 64; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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