1. Center of Excellence for Advanced Materials Research (CEAMR) King Abdulaziz University Jeddah 21589 P.O. Box 80203 Saudi Arabia
2. Department of Chemistry Faculty of Science King Abdulaziz University Jeddah 21589 P.O. Box 80203 Saudi Arabia
3. Center for Nanotechnology Department of Natural Sciences Coppin State University Baltimore MD 21216 USA