1. Centre
for Materials Science and Nanotechnology, Department of Physics, University of Oslo, FERMiO, Gaustadalléen 21, NO-0349 Oslo, Norway
2. Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milan, Italy
3. SINTEF Materials and Chemistry, Forskningsveien 1, NO-0314 Oslo, Norway
4. Centre for
Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, FERMiO, Gaustadalléen
21, NO-0349 Oslo, Norway