1. Department of Earth and Environmental Sciences and Center for NanoScience (CeNS), Ludwig-Maximilians-University, Theresienstrasse 41, 80333 Munich, Germany, Center of Micro and Nanochemistry and Engineering, Organische Chemie I, University Siegen, Adolf-Reichwein-Strasse 2, 57068 Siegen, Germany, Deutsches Museum, Museumsinsel 1, 80538 Munich, Germany, and Department of Physics, TUM School of Education, Technical University Munich, Schellingstrasse 33, 80333 Munich, Germany