1. Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Chengalpattu District, Tamilnadu, India
2. Department of Physics and Nanotechnology, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Chennai 603203, Chengalpattu District, Tamilnadu, India
3. Department of Physics, SRM Valliammai Engineering College, Kattankulathur, Chennai 603203, Chengalpattu District, Tamilnadu, India