1. Laboratory for Advanced Analytical Technologies, Swiss Federal Institute for Materials Science and Technology Empa, Überlandstrasse 129, 8600 Dübendorf, Switzerland
2. Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
3. Zürich University of Applied Sciences ZHAW, Einsiedlerstrasse 31, 8820 Wädenswil, Switzerland