1. International and Inter University Centre for Nanoscience and Nano Technology; Mahatma Gandhi University; Kottayam 686560 Kerala India
2. School of Chemical Sciences; Mahatma Gandhi University; Kottayam 686560 Kerala India
3. School of Pure and Applied physics; Mahatma Gandhi University; Kottayam 686560 Kerala India
4. Faculty of Applied Sciences; Universiti Teknologi MARA; 40450 Shah Alam Malaysia