Adsorbed water on hydrothermal BaTiO3 films: Work function measurements

Fuenzalida, V.M.; Pilleux M.E.; Eisele I.

Keywords: adsorption, spectroscopy, films, water, humidity, probes, sensors, ray, work, measurement, polycrystalline, photoelectron, function, hydrothermal, chemical, Materials, X, atmospheric, Metallic, Kelvin


We have investigated the time dependence of water adsorption on polycrystalline barium titanate films fabricated on silicon under hydrothermal conditions. X-ray photoelectron spectroscopy showed surface OH groups on the films but no molecular H2O. The time dependent behavior of water adsorption was investigated by measuring the work function changes with a Kelvin probe. The film response time for both increasing and decreasing humidity is less than one minute. The typical amplitude change was about 0.05 eV for a 50% humidity variation, with higher variations at lower humidity.

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Título de la Revista: VACUUM
Volumen: 55
Número: 1
Fecha de publicación: 1999
Página de inicio: 81
Página final: 83