1. Department of Chemistry, University of Kerala, Karyavattom campus, Thiruvananthapuram, Kerala – 695 581, India
2. NANOTECH Center, Ural Federal University, Ekaterinburg 620002, Russia
3. Physics Department, Faculty of Science, Tanta University, Tanta 31527, Egypt
4. Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090, Rostov-on-Don, Russia
5. Centre for Renewable Energy and Materials, University of Kerala, Kariavattom Campus, Thiruvananthapuram, Kerala, 695 581, India