1. Nanotechnology and Catalysis Research Center (NANOCAT); University of Malaya; Kuala Lumpur Malaysia
2. Physics Department, Faculty of Science; University of Sidi-Bel-Abbes; Algeria
3. Department of Physics, Renewable Energy Laboratory; University of Tabuk; Tabuk KSA
4. Center for Advanced Materials; University of Houston; Houston Texas USA
5. Institute of Nano Electronic Engineering; University Malaysia Perlis; Kangar Perlis Malaysia