1. Materials Science and Engineering, Koç University, 34450 Istanbul, Turkey
2. Koç University Tüpraş Energy Center (KUTEM), 34450 Istanbul, Turkey
3. Department of Physics, Chalmers University of Technology, SE-412 96, Gothenburg, Sweden
4. Materials Science and Nano Engineering, Sabancı University, 34956 Istanbul, Turkey
5. Departments of Physics and Electrical-Electronics Engineering, Koç University, Istanbul 34450, Turkey
6. Koç University Surface Science and Technology Center (KUYTAM), Istanbul 34450, Turkey
7. Department of Chemistry, Koç University, 34450 Istanbul, Turkey