1. Gebze Technical University, Department of Physics 41400 Gebze, Kocaeli, Turkey
2. Gebze Technical University, Institute of Nanotechnology 41400, Gebze, Kocaeli, Turkey
3. Sabancı University, SUNUM, Nanotechnology Research and Application Center, 34956 Istanbul, Tuzla, Turkey
4. Sabancı University, Faculty of Engineering and Natural Sciences, 34956 Istanbul, Tuzla, Turkey
5. Gebze Technical University, Department of Materials Science and Engineering 41400 Gebze, Kocaeli, Turkey