1. Material Science and Technology Program, College of Arts and Sciences, Qatar University, 2713 Doha, Qatar
2. Liberal Arts and Science, Virginia Commonwealth University School of Arts in Qatar, PO Box 8095, Doha, Qatar
3. Functional NanoMaterials Group, Department of Applied Physics, School of Engineering Sciences, KTH Royal Institute of Technology, Hannes Alfvéns väg 12, 11419 Stockholm, Sweden