1. International and Inter University Center for Nanoscience and Nanotechnology; Mahatma Gandhi University; P D Hills Kottayam India
2. School of Pure and Applied Physics; Mahatma Gandhi University; P D Hills Kottayam India
3. Institut Jean Lamour; UMR CNRS7198; Université de Lorraine; Vandoeuvre-Lès Nancy 54000 France
4. School of Chemical Sciences; Mahatma Gandhi University; P D Hills Kottayam India