1. Institute of Physical Chemistry and Electrochemistry; Leibniz Universität Hannover; Callinstraße 3A D-30167 Hannover Germany
2. Laboratory for Nano and Quantum Engineering; Leibniz Universität Hannover; Schneiderberg 39 30167 Hannover Germany
3. Institute for Technical Chemistry; Leibniz Universität Hannover; Callinstraße 3 D-30167 Hannover Germany
4. Institut für Festkörperphysik; Leibniz Universität Hannover; Appelstraße 2 30167 Hannover Germany
5. Laboratory for Nanocomposite Materials; Department of Photonics; Faculty of Physics; Saint-Petersburg State University; Ulianovskaia street 3, Peterhof Saint Petersburg 198504 Russia