1. DTU Nanotech - Department of Micro- and Nanotechnology; Technical University of Denmark, Produktionstorvet, 2800 Kgs. Lyngby; Denmark
2. DTU Nanotech - Department of Micro- and Nanotechnology; Center for Nanostructured Graphene, CNG, Produktionstorvet, 2800 Kgs. Lyngby; Denmark
3. Niels Bohr Institute, University of Copenhagen; Copenhagen 2100 Denmark