1. Department of Chemistry, Faculty of Science, Al-Azhar University, Cairo, Egypt
2. Federal Institute for Materials Research and Testing (BAM), Berlin, Germany
3. Physics Department and Plasma Center, Faculty of Science, Al Azhar University, Cairo, Egypt
4. College of Science and Arts, University of Bisha, Bisha, Saudi Arabia
5. Department of Chemistry, Turabah University College, Taif University, Taif, Saudi Arabia
6. Polymertechnik und Polymerphysik, Technical University Berlin, Berlin, Germany