1. Department of Chemistry and Centre for Nanoscience and Technology, KPR Institute of Engineering and Technology, Coimbatore, Tamilnadu 641407, India
2. Department of Physics, Bharathiar University, Coimbatore, Tamilnadu 641046, India
3. National Centre for Nanoscience and Technology, University of Madras, Chennai, Tamilnadu 600025, India
4. DRDO-Life Sciences, Bharathiar University, Coimbatore, Tamilnadu 641046, India