1. Nano-Science Center, Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
2. Geological Survey of Denmark & Greenland (GEUS), Øster Voldgade 10, 1350 Copenhagen, Denmark
3. iNANO-Kemi, Aarhus University, Langelandsgade 140, Aarhus, Denmark