1. Research Group on Carbon Nanostructures (CARBONNAGe); University of Namur; 61 Rue de Bruxelles 5000 Namur Belgium
2. Department of Mechanical and Materials Engineering; Masdar Institute of Science and Technology; A part of Khalifa University of Science and Technology; 54224 Abu Dhabi United Arab Emirates
3. Laboratory of Advanced Microscopies (LMA); Institute of Nanoscience of Aragón (INA); Universidad de Zaragoza; c/Mariano Esquillor 50018 Zaragoza Spain
4. Department of Electronic Engineering; Fundacion ARAID; 50004 Zaragoza Spain
5. MINOS-EMaS; Universitat Rovira i Virgili; 43007 Tarragona Spain
6. Institut für Festkörperphysik; Technische Universität Dresden; D-01062 Dresden Germany
7. Physics Department; Saint-Petersburg State University; Saint Petersburg 198504 Russia
8. Donostia International Physics Center (DIPC); Departamento de Fisica de Materiales, CFM-MPC UPV/EHU; 20080 San Sebastian Spain
9. IKERBASQUE; Basque Foundation for Science; 48011 Bilbao Spain
10. Chimie des Interactions Plasma-Surface (ChIPS); CIRMAP; Research Institute for Materials Science and Engineering; University of Mons; 7000 Mons Belgium