1. National Center for Materials Study and Testing, Technical University of Moldova, Stefan Cel Mare Ave. 168, MD-2004 Chisinau, Republic of Moldova
2. Institute for Materials Science, Kiel University, Kaiserstrasse 2, D-24143 Kiel, Germany
3. Department of Physics and Engineering, State University of Moldova, Alexei Mateevici St. 60, MD-2009 Chisinau, Republic of Moldova
4. Nanochemistry, Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany
5. Mads Clausen Institute, NanoSYD, University of Southern Denmark, Alsion 2, 6400 Sønderborg, Denmark
6. H. H. Wills Physics Laboratory, School of Physics, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
7. Academy of Sciences of Moldova, Stefan Cel Mare Ave. 1, MD-2001 Chisinau, Republic of Moldova