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Titanium dioxide for hydrogen generation in photoelectrochemical cells

100%

Radecka M. , Zakrzewska K.

Biuletyn Polskiego Stowarzyszenia Wodoru i Ogniw Paliwowych

2011

nr 6

20-25

Photocatalytical Decomposition of Contaminants οn Thin Film Gas Sensors

70%

Radecka M. , Łysoń B. , Lubecka M. , Czapla A. , Zakrzewska K.

Acta Physica Polonica A

2010

tom 117

nr 2

415-419

Gas sensing materials have been prepared in a form of TiO_{2}-SnO_{2} thin films by rf reactive sputtering from Ti:SnO_{2} and Sn:TiO_{2} targets. Material studies have been performed by scanning electron microscopy, atomic force microscopy, X-ray diffraction at grazing incidence, Mössbauer spectroscopy, X-ray photoelectron spectroscopy and optical spectrophotometry. Dynamic gas sensing responses have been recorded as reproducible changes in the electrical resistance upon introduction of hydrogen at a partial pressure of 100-6000 ppm over a wide temperature range 473-873 K. Contamination experiments have been carried out with the motor oil (40 vol.% solution in CCl_{4}) in order to study the effect of UV light illumination on the gas sensor response. Optical spectroscopy has been applied to monitor the photodecomposition of the test compound, bromothymol blue. The Electronic Nose, ALPHA MOS FOX 4000 has been used in order to differentiate between different groups of motor oil vapors.

Solid-State Solutions of TiO_{2}-SnO_{2} and SrTiO_{3}-BaTiO_{3}

61%

Zakrzewska K. , Radecka M. , Pasierb P. , Bućko M. , Urbaniec E. , Janas J.

Acta Physica Polonica A

1997

tom 91

nr 5

899-903

Thin films of TiO_{2}-SnO_{2} and SrTiO_{3}-BaTiO_{3} are deposited by rf sputtering. The crystallographic and optical properties near the band gap absorption are investigated as a function of film composition. Systematic displacement of the fundamental absorption edge shows different behaviour for amorphous and polycrystalline samples. Results are discussed in terms of the influence of the substitution on the local environment of Ti ion and Me-O distances. Application of XANES and EXAFS is proposed for the studies of solid-state solutions.