1. Department of Physics, University of Oslo, PO Box 1048, Blindern, N-0316 Oslo, Norway
2. Department of Materials Science, School of Chemistry, Madurai Kamaraj University, Madurai 625 021, India
3. SINTEF Industry, PO Box 124, Blindern, NO-0314 Oslo, Norway
4. Department of Chemistry, University of Oslo, PO Box 1033, Blindern, N-0315 Oslo, Norway
5. i3N/CENIMAT, Department of Materials Science, i3 N/CENIMAT, NOVA University, Lisbon 2829-516 Caparica, Portugal
6. CeFEMA, Instituto Superior Técnico (IST), Universidade de Lisboa, Lisboa 1049-001, Portugal