1. Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering and TechnologyUniversity of Dhaka Dhaka 1000 Bangladesh
2. Department of Applied Chemistry and Chemical EngineeringNoakhali Science and Technology University, Sonapur Noakhali- 3814 Bangladesh
3. Department of Physics, Faculty of ScienceUniversity of Dhaka Dhaka 1000 Bangladesh
4. Institute of Radiation and Polymer TechnologyBangladesh Atomic Energy Commission Dhaka Bangladesh