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Synthesis and gas-sensing properties of nano- and meso-porous MoO3-doped SnO2
- Source :
-
Sensors & Actuators B: Chemical . Jun2010, Vol. 147 Issue 2, p554-560. 7p. - Publication Year :
- 2010
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Abstract
- Abstract: Nano- and meso-porous SnO2 powders doped with and without 1–10wt% MoO3 have been synthesized by an ultrasonic spray-pyrolysis method employing a precursor aqueous solution containing tin (IV) chloride pentahydrate (SnCl4·5H2O), ammonium heptamolybdate and polymethylmethacrylate (PMMA) microspheres as a template, and the effects of MoO3-doping and the addition of PMMA microspheres on the structural, morphological and gas-sensing properties of SnO2 were investigated in this study. It is confirmed that control of the amounts of PMMA microspheres in the precursor solution was effective in realizing well-developed nano- and meso-porous structures of SnO2 by X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and the measurement of specific surface area and pore size distribution using a N2 adsorption isotherm. Gas-sensing properties of their thick films (about 50μm thick), which were fabricated by screen-printing to various gases (NO2, C2H5OH and H2) were tested in ambient air. The doped thick films showed a high response and selectivity to 5ppm NO2 gas in the case of 10wt% MoO3-doping in both nano- and meso-porous structures of SnO2. We observed that the presence of Mo species in SnO2 lattice can improve the sensor response and selectivity towards NO2 gas. The effect of the MoO3-doping on the sensing characteristics of these films towards NO2 was discussed. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09254005
- Volume :
- 147
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Sensors & Actuators B: Chemical
- Publication Type :
- Academic Journal
- Accession number :
- 50959926
- Full Text :
- https://doi.org/10.1016/j.snb.2010.03.021