1. Institute of Materials Chemistry Vienna University of Technology Veterinärplatz 1/GA 1210 Vienna (Austria)
2. Institut des Nanosciences de Paris Campus de Boucicaut 140 Rue de Lourmel 75015 Paris (France)
3. University Service Centre for Transmission Electron Microscopy Vienna University of Technology Wiedener Hauptstrasse 8–10/052 1040 Vienna (Austria)