1. Nanoscience Program, Institute of Basic and Applied Sciences, Egypt-Japan University of Science and Technology, New Borg El-Arab City, Alexandria 21934, Egypt
2. National Institute of Standards, Tersa St, El-Matbah, Haram, P. O. Box: 136, Code No 12211, Giza, Egypt
3. Graphene Center of Excellence for Energy and Electronics Applications, Egypt-Japan University of Science and Technology, New Borg El-Arab, 21934, Egypt
4. Department of Environmental Studies, Institute of Graduate Studies and Research, Alexandria University, Alexandria, Egypt
5. Physical Chemistry Department, National Research Centre, El-Dokki, Cairo, 12622, Egypt