1. Department of Chemistry, Bilkent University, 06800 Bilkent, Ankara, Turkey
2. Department of Physics, Recep Tayyip Erdogan University, 53100 Rize, Turkey
3. Department of Physics, Middle East Technical University, Dumlupinar Bulvari 1, 06800 Ankara, Turkey
4. Dipartimento di Scienze Chimiche e Farmaceutiche, Universita degli Studi di Trieste, Via L. Giorgieri 1, 34127 Trieste, Italy
5. UNAM—National Nanotechnology Research Center, Institute of Materials Science and Nanotechnology, Bilkent University, 06800 Bilkent, Ankara, Turkey