期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 238, 期 -, 页码 16-23出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.06.172
关键词
H2S sensors; BaTiO3; Nanoparticle; Low temperature
Ce-doped BaTiO3 (Ba0.99Ce0.01TiO3) nanoparticles with the sizes of 30-60 nm were prepared by the co-precipitation method, and sensors were fabricated by spin coating the nanoparticles on FTO substrates. To further enhance the sensing properties, alpha-Fe2O3 was decorated to the Ba0.99Ce0.01TiO3 sensor. The Fe2O3-Ba0.99Ce0.01TiO3 sensor showed fascinating gas sensing performances towards H2S, including the ability to detect low concentrations of H2S (400 ppb or lower), fast response and recovery speed (t(res) = 45 s and t(rec) =124 s) and low working temperatures (150 degrees C). When exposed to H2S, the sensor resistance increased, due to the reduction of Ce4+ to Ce3+ and the chemical reactions of oxygen species. (C) 2016 Elsevier B.V. All rights reserved.
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