1. Department of Chemistry, University of Kerala, Kariavattom Campus, Thiruvananthapuram, Kerala 695 581, India
2. Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090 Rostov-on-Don, Russia
3. Department of Chemistry, University College, Thiruvananthapuram, Kerala 695034, India
4. NANOTECH Center, Ural Federal University, Ekaterinburg 620002, Russia
5. Centre for Renewable Energy and Materials, University of Kerala, Kariavattom Campus, Thiruvananthapuram, Kerala 695 581, India