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Materials 2015, 8(9), 6437-6454; doi:10.3390/ma8095311

Nanocrystalline BaSnO3 as an Alternative Gas Sensor Material: Surface Reactivity and High Sensitivity to SO2

1
Chemistry Department, Moscow State University, Leninskie Gory 1-3, Moscow 119991, Russia
2
Kurnakov Institute of General and Inorganic Chemistry, Leninskiy prospect 31, Moscow 119991, Russia
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Elisabetta Comini
Received: 14 July 2015 / Revised: 31 August 2015 / Accepted: 11 September 2015 / Published: 18 September 2015
(This article belongs to the Special Issue Nanostructured Materials for Chemical Sensing Applications)
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Abstract

Nanocrystalline perovskite-type BaSnO3 was obtained via microwave-assisted hydrothermal route followed by annealing at variable temperature. The samples composition and microstructure were characterized. Particle size of 18–23 nm was unaffected by heat treatment at 275–700 °C. Materials DC-conduction was measured at variable temperature and oxygen concentration. Barium stannate exhibited n-type semiconductor behavior at 150–450 °C with activation energy being dependent on the materials annealing temperature. Predominant ionosorbed oxygen species types were estimated. They were shown to change from molecular to atomic species on increasing temperature. Comparative test of sensor response to various inorganic target gases was performed using nanocrystalline SnO2-based sensors as reference ones. Despite one order of magnitude smaller surface area, BaSnO3 displayed higher sensitivity to SO2 in comparison with SnO2. DRIFT spectroscopy revealed distinct interaction routes of the oxides surfaces with SO2. Barium-promoted sulfate formation favoring target molecules oxidation was found responsible for the increased BaSnO3 sensitivity to ppm-range concentrations of SO2 in air. View Full-Text
Keywords: barium stannate; sulfur dioxide; nanocrystalline tin dioxide; semiconductor gas sensor; gas-solid interaction barium stannate; sulfur dioxide; nanocrystalline tin dioxide; semiconductor gas sensor; gas-solid interaction
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Marikutsa, A.; Rumyantseva, M.; Baranchikov, A.; Gaskov, A. Nanocrystalline BaSnO3 as an Alternative Gas Sensor Material: Surface Reactivity and High Sensitivity to SO2. Materials 2015, 8, 6437-6454.

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