1. Center of Science and Technology App. and Research, Balikesir University, Balikesir, Turkey
2. Department of Physics, Faculty of Science and Art, Balikesir University, Balikesir, Turkey
3. Department of Physics, Molecular Nano-Materials Laboratory, Faculty of Science, Mugla Sitki Kocman University, Mugla, Turkey
4. Dokuz Eylul Univ, Faculty of Arts & Sciences, Department of Physics, Izmir, Turkey
5. Dipartimento di Chimica “U. Schiff” and UdR INSTM, Università di Firenze, Sesto Fiorentino (FI), Italy