1. Department of Applied Sciences (Chemical Science Division), Gauhati University, Guwahati 781014, India
2. Department of Chemistry, University of Kerala, Kariavattom Campus, Thiruvananthapuram, Kerala 695581, India
3. Advanced Materials Group, Materials Sciences and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, India
4. Department of Chemistry, Gauhati University, Guwahati 781014, India