1. Electro-Materials Research Laboratory, Centre for Nanoscience and Technology, Pondicherry University, Puducherry 605 014, India
2. Department of Chemistry, College of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur 603 203, India
3. Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia