1. Department of Chemistry, School of Sciences & Engineering, The American University in Cairo, AUC Avenue, New Cairo 11835, Egypt
2. Center for Materials Science, Zewail City of Science and Technology, Sixth of October,12578 Giza, Egypt
3. Chemistry Department, Faculty of Science, Menoufia University, 32512 Shebin El-Kom, Egypt
4. Department of Nanobiophotonics, Leibniz Institute of Photonic Technology, Jena 07745, Germany