1. Department of Polymer Science and Rubber Technology, Cochin University of Science and Technology, Cochin, Kerala 682022, India
2. Inter University Centre for Nanomaterials and Devices (IUCND), Cochin University of Science and Technology, Cochin, Kerala 682022, India
3. Department of Instrumentation, Cochin University of Science and Technology, Cochin, Kerala 682022, India
4. Department of Applied Chemistry, Cochin University of Science and Technology, Cochin, Kerala 682022, India
5. Centre for Advanced Materials (CAM), Cochin University of Science and Technology, Cochin, Kerala 682022, India