1. Nano Carbon Materials and Center for Sustainable Future Technologies, Istituto Italiano di Tecnologia (IIT), via Livorno 60, 10144 Torino, Italy
2. Department of Chemistry and Industrial Chemistry, University of Genova, via Dodecaneso 31, 16145 Genova, Italy
3. Electron Microscopy Facility, Istituto Italiano di Tecnologia (IIT), Via Morego 30, 16163 Genova, Italy
4. Department of Chemistry, University of Torino, via Giuria 7, 10125 Torino, Italy