Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Strasse 40, 34132 Kassel, Germany ...

The spectra were obtained with an Ocean Optics spectrophotometer model USB-650 UV-VIS (Dunedin, USA) and using a 1 mm quartz cuvette. All spectra were obtained in the range from 200 to 400 nm (1 nm ...

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