1. Centre for Materials Science and Nanotechnology (SMN), Department of Chemistry, University of Oslo, N-0315 Oslo, Norway
2. Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, Via P. Giuria 7, 10125 Turin, Italy
3. Centre for Materials Science and Nanotechnology (SMN), Department of Physics, University of Oslo, N-0315 Oslo, Norway
4. Materials Physics Oslo, SINTEF Industry, Forskningsveien 1, NO-0373 Oslo, Norway