1. Sudan Atomic Energy Commission (SAEC), Khartoum, Sudan;
2. Department of Chemistry, Faculty of Education, University of Khartoum, Sudan;
3. Institute of Research and Consultancy, King Faisal University, Hofuf, Saudi Arabia;
4. Department of Physics, Taibah University, Medina, Saudi Arabia;
5. Department of Chemistry, College of Science, King Khalid University, Abha, Saudi Arabia;
6. Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha, Saudi Arabia