1. International Iberian Nanotechnology Laboratory, Braga 4715-330, Portugal
2. Inorganic Chemistry Department, Biomedical Research Centre (CINBIO), Universidade de Vigo, Vigo 36210, Spain
3. Center of
Physics, University of Minho, Braga 4710-057, Portugal
4. Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
5. Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
6. Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011, United States
7. Laboratoire CRISMAT,
UMR 6508, CNRS-ENSICAEN, Caen 14050, France