1. Cochin University of Science and Technology, Ernakulam 682022, Kerala, India
2. Polymers and Special Chemicals Division, Vikram Sarabhai Space Centre, Thiruvananthapuram 695022, India
3. Department of Chemistry, Indian Institute of Space Science and Technology, Thiruvananthapuram 695547, India
4. Analytical and Spectroscopy Division, Vikram Sarabhai Space Centre, Thiruvananthapuram 695022, India