1. Deutsches Museum, Museumsinsel 1, 80538 Munich, Germany, TUM School of Education, Technische Universität Munich, Schellingstrasse 33, 80799 Munich, Germany, and Center for NanoScience (CeNS)
2. Department for Earth- and Environmental Sciences and Center for NanoScience (CeNS), Ludwig-Maximilians-University, Theresienstrasse 41, 80333 Munich, Germany
3. Department of Chemistry and Center for NanoScience (CeNS), Ludwig-Maximilians-University, Butenandtstrasse 11 (E), 81377 Munich, Germany
4. Physical Electronics GmbH, Fraunhoferstr. 4, 85737 Ismaning, Germany