1. Department of Materials Science, School of Chemistry; Madurai Kamaraj University; Madurai - 625 021, Tamil Nadu India
2. Department of Computational Physics, School of Physics; Madurai Kamaraj University; Madurai - 625 021, Tamil Nadu India
3. Department of Materials Science and Nano Engineering; Rice University; Houston - 77005, Texas USA
4. Department of Physics, School of Physics; Madurai Kamaraj University; Madurai - 625 021, Tamil Nadu India
5. Department of Materials Science and Engineering; Michigan Technological University; Houghton - 49931, Michigan USA
6. Department of Electrical & Computer Engineering; Michigan Technological University; Houghton - 49931, Michigan USA