1. Department of Chemistry; Middle East Technical University; Ankara 06800 Turkey
2. Department of Polymer Science and Technology; Middle East Technical University; Ankara 06800 Turkey
3. Department of Biotechnology; Middle East Technical University; Ankara 06800 Turkey
4. The Center for Solar Energy Research and Application (GUNAM), Middle East Technical University; Ankara 06800 Turkey
5. Department of Micro and Nanotechnology; Middle East Technical University; Ankara 06800 Turkey