1. International and Inter-University Centre for Nanoscience and Nanotechnology Mahatma Gandhi University Kottayam 686 560 Kerala India
2. Department of Chemical Sciences Ariel University Ariel 40700 Israel
3. School of Nanoscience and Nanotechnology Mahatma Gandhi University Kottayam 686 560 Kerala India
4. School of Pure and Applied Physics Mahatma Gandhi University Kottayam 686 560 Kerala India