1. Department of Materials and Production, Aalborg University, 9220 Aalborg Øst, Denmark
2. Center for Nanostructured Graphene (CNG), 9220 Aalborg Øst, Denmark
3. Computational Atomic-scale Materials Design (CAMD), Department of Physics, Technical University of Denmark (DTU), 2800 Kgs. Lyngby, Denmark
4. Center for Nanostructured Graphene (CNG), Technical University of Denmark (DTU), 2800 Kgs. Lyngby, Denmark