Journal
MATERIALS RESEARCH BULLETIN
Volume 64, Issue -, Pages 252-256Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2014.12.049
Keywords
Oxide; Semiconductors; Solvothermal; Defects
Categories
Funding
- National Natural Science Foundation of China [51372013, 21177007]
- Fundamental Research Funds for the Central Universities [YS1406]
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University
- Beijing Key Laboratory of Environmentally Harmful Chemicals Analysis
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Orthorhombic molybdenum trioxide (alpha-MoO3) nanorods with well-defined morphology and high crystalline have been synthesized by a facile and fast hydrothermal method under 85 degrees C for 1.5 h without employing surfactants or templates. The controlling of stirring time, thermostatic time and HNO3 amount is crucial for the growth of alpha-MoO3 nanorods. The morphology and structure of alpha-MoO3 were characterized by field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The obtained alpha-MoO3 nanorods as a novel sensing material exhibit high sensitivity, the highest response to 40 ppm CO is 239.6 at operating temperature of 292 degrees C. The intrinsic sensing performance arises from the non-stoichiometry of the alpha-MoO3 due to the presence of Mo5+ in MoO3 lattice, that is, the molecular formula of MoO3 should be expressed as MoO3-x (x = 0.08), which has been confirmed by X-ray photoelectron spectroscopic (XPS) analysis and room temperature photoluminescence (PL). The sensing mechanism of alpha-MoO3 to CO was also discussed in terms of lattice oxygen in MoO3. (C) 2014 Elsevier Ltd. All rights reserved.
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