1. Department of Chemistry and Institute for Coatings and Surface Chemistry, Niederrhein University of Applied Sciences, Adlerstr. 1, D-47798 Krefeld, Germany
2. Spectrum Info Ltd., Murmanskaya 5, 02094 Kyiv, Ukraine
3. Department of Physical Chemistry and Center of Nanointegration (CENIDE), University of Duisburg-Essen, Universitätsstr. 7, 45141 Essen, Germany