Effect of grain boundaries on hydrocarbon sensing in the Fe doped p-type semiconducting perovskite SrTiO3 films

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DOIResolve DOI: http://doi.org/10.1063/1.1922584
AuthorSearch for: ; Search for:
TypeArticle
Journal titleJournal of Applied Physics
Volume97
AbstractFilms of Fe-doped SrTiO3 deposited using pulsed laser deposition on sapphire and alumina, when exposed to propane, showed different sensor responses measured sas a resistance changed as a function of temperature and microstructure. The film deposited on alumina has a stronger response towards 3000-ppm propane than does the film deposited on sapphire. Films deposited on alumina exhibit higher dc conductivity than the films on sapphire. The activation energies indicate a mixed electronic/ionic conduction at low temperature with the high-temperature regime showing a temperature-independent conductivity. The origin of the difference in gas responses caused by varying temperature and morphology has been explored using ac impedance techniques and measured as a function of frequency s1 Hzøfø1 MHzd and temperature s200øTø480 °Cd. A single relaxation sa single semicircle in the complex impedance planed in the frequency domain was observed in addition to the relaxation due to the electrode-film interface. A model and a mechanism of conduction for the above are derived using equivalent circuits to fit the ac impedance data and dc conductivity. It is proposed that the reduction of Fe-doped SrTiO3, which is induced by propane, enhances the space-charge barrier near the grain boundaries and increases the sensitivity to propane.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology
Peer reviewedYes
NRC number52122
NPARC number16157241
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Record identifier2a0d9f79-a8a6-4194-b0fb-19a9d5706213
Record created2010-10-06
Record modified2017-03-23
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