1. Department of Chemistry, National Institute of Technology, Calicut, Calicut Mukkam Road, Kattangal, Kerala 673601, India
2. Department of Physics, Shyampur Siddheswari Mahavidyalaya, Ajodhya, Shyampur, Howrah, Pin-711312& JIS College of Engineering Block A, Phase-III, Kalyani, Nadia, Pin-741235, India