1. Department of Physics, University of Rajshahi, Rajshahi, Bangladesh
2. UGC (Bangladesh University Grants Commission) Professor, Dhaka, Bangladesh
3. Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Cape Town, South Africa
4. UNESCO-UNISA Africa Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Pretoria, South Africa
5. Department of Physics, Florida A & M University, Tallahassee, FL, USA