1. Department of Physics, Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway
2. Bavarian Polymer Institute and Department of Chemistry, University of Bayreuth, Universitätsstraße 30, D-95447 Bayreuth, Germany
3. Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
4. Departamento de Física dos Materiais e Mecânica, Instituto de Física, Universidade de São Paulo, 05508-090 São Paulo, SP, Brazil
5. Institute for Energy Technology (IFE), P.O. Box 40, N-2027 Kjeller, Norway
6. Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße 150, 44780 Bochum, Germany