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Catalytic Combustion‐Type Hydrogen Sensor Using BaTiO 3 ‐based PTC Thermistor
Author(s) -
Yuasa Masayoshi,
Nagano Takahito,
Tachibaoki,
Kida Tetsuya,
Shimanoe Kengo
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12217
Subject(s) - thermistor , oxalic acid , catalysis , materials science , atmospheric temperature range , chemical engineering , analytical chemistry (journal) , chemistry , inorganic chemistry , chromatography , organic chemistry , electrical engineering , physics , engineering , meteorology
A catalytic combustion‐type gas sensor using a positive temperature coefficient ( PTC ) thermistor, which shows a sharp resistance change around Curie temperature, was developed for the detection of hydrogen. La ‐doped BaTiO 3 ( Ba 0.998 La 0.002 TiO 3 ) was prepared through a solid‐state method and an oxalic acid method. La ‐doped BaTiO 3 obtained by the oxalic acid method showed improved PTC properties, due to the formation of fine particles, as compared to that prepared with the solid‐state method. The resulting sensor device showed a fairly high H 2 sensitivity in the range of 100–1000 ppm. In addition, the H 2 sensitivity and response speed were improved by coating a Pt / SiO 2 catalyst on the sensor device because the catalytic combustion efficiency of H 2 was improved by the catalyst coating.