1. Department of Micro and Nanotechnology; Middle East Technical University; 06800 Ankara Turkey
2. GÜNAM; Middle East Technical University; 06800 Ankara Turkey
3. Department of Physics; Düzce University; 81620 Düzce Turkey
4. DÜTEM; Düzce University; 81620 Düzce Turkey
5. Department of Chemical Engineering; Middle East Technical University; 06800 Ankara Turkey
6. Department of Physics; Middle East Technical University; 06800 Ankara Turkey