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This paper deals with photocatalytic activity of silver treated TiO2 films. The TiO2 films were deposited on glass substrates by plasma enhanced chemical vapor deposition (PECVD) in a vacuum reactor with radio frequency (RF) low temperature plasma discharge in the mixture of oxygen and titanium isopropoxide vapors (TTIP). The depositions were performed under different deposition conditions. Subsequently, the surface of TiO2 films was modified by deposition of silver nanoparticles. Photocatalytic activity of both silver modified and unmodified TiO2 films was determined by decomposition of the model organic matter (acid orange 7). Selected TiO2 samples were used for tests of antibacterial activity. These tests were performed on Gram-negative bacteria Escherichia coli. The results clearly proved that presence of silver clusters resulted in enhancement of the photocatalytic activity, which was up to four times higher than that for pure TiO2 films. [ABSTRACT FROM AUTHOR]

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We performed a series of measurements by means of the triple probe technique during plasma deposition of polymer films on large volume plastic containers. Based on the measured data, the process stability and process homogeneity were determined. The process stability was better than 5% and process reproducibility was about 6%. An inhomogeneity of the plasma density correlated to the barrier efficiency of the film deposited at different positions on the container. An increase in the power losses were found after changes in the electrical configuration of the deposition set-up. The quotient of electron density ne and product of molar mass of the working gas M and its flow F is proposed as invariant instead the Yasuda's parameter W/MF for characterization of large-scale industrial plasma polymerization process. [ABSTRACT FROM AUTHOR]