1. Department of Physics, Adnan Menderes University, Aydın 09100, Turkey
2. Department of Physics, Bilkent University, Ankara 06800, Turkey
3. UNAM - National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
4. Andlinger Center for Energy and the Environment, Princeton University, New Jersey 08544, USA
5. Nanotechnology Application and Research Center, Adnan Menderes University, Aydın 09010, Turkey
6. Department of Electric and Electronic Engineering, Adnan Menderes University, Aydın Aydin 09100, Turkey