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

Materials

Artem Marikutsa²  Marina Rumyantseva²  Alexander Baranchikov¹  Alexander Gaskov² 

[1] Kurnakov Institute of General and Inorganic Chemistry, Leninskiy prospect 31, Moscow 119991, Russia; E-Mail:;Chemistry Department, Moscow State University, Leninskie Gory 1-3, Moscow 119991, Russia; E-Mails:

关键词: barium stannate;    sulfur dioxide;    nanocrystalline tin dioxide;    semiconductor gas sensor;    gas-solid interaction;   

DOI  :  10.3390/ma8095311

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.