1. Department of Chemistry; King Fahd University of Petroleum and Minerals; Dhahran 31261 Saudi Arabia
2. Center of Research Excellence in Nanotechnology; King Fahd University of Petroleum and Minerals; Dhahran 31261 Saudi Arabia
3. Department of Chemistry; College of Sciences and Humanities; Prince Sattam bin Abdulaziz University; Al-Kharj 11942 Saudi Arabia