Affiliation: | 1. Department of Chemistry, Osmania University, Hyderabad ‐ 500 007, India;2. Nizam College, Osmania University, Hyderabad ‐ 500 001, India;3. Department of Physics, Osmania University, Hyderabad ‐ 500 007, India;4. Centre for Materials Electronics Technology, Hyderabad‐ 500 051, India |