1. Institute of Nanoscience and Nanotechnology, National Center for Scientific Research Demokritos, Agia Paraskevi, 15341 Athens, Greece
2. Department of Chemistry, University of Crete, Laboratory of Bioinorganic Chemistry, Voutes Campus, 70013 Heraklion, Crete, Greece
3. Solid State Physics Section, Physics Department, National and Kapodistrian University of Athens, Panepistimioupolis, 15784 Zografos, Athens, Greece
4. Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, Vas. Constantinou Avenue 48, 11635 Athens, Greece
5. Department of Physics, University of Konstanz, 78457 Konstanz, Germany
6. Department of Chemistry, Quaid-i-Azam University, 45320 Islamabad, Pakistan
7. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 266101 Qingdao, China