1. Nanotech Research Lab, Department of Chemistry, University College of Engineering Villupuram (A Constituent College of Anna University, Chennai), Kakuppam, Villupuram, Tamil Nadu, India
2. Department of Chemistry, SDNB Vaishnav College for Women, Chrompet, Chennai 600 044, India
3. Polymer Engineering Laboratory, PSG Institute of Technology and Applied Research, Neelambur, Coimbatore 641 062, India