1. International and Interuniversity Center for Nanoscience and Nanotechnology; Mahatma Gandhi University; P.D.Hills (P.O), Kottayam 686 560 Kerala India
2. School of Chemical Sciences; Mahatma Gandhi University; Kottayam
3. Institute of Materials Research and Engineering (IMRE), Agency for Science; Technology and Research (A*STAR); 2 Fusionopolis Way, Singapore 138634
4. Materials and Surface Science Institute; University of Limerick; Ireland