1. Thin Films & Nanomaterials Research Laboratory, Department of Physics, Osmania University, Hyderabad, Telangana State 500 007, India
2. Nanosensor Research Laboratory, Department of Physics, CMR Technical Campus, Kandlaokoya, Hyderabad, Telangana State 501 401, India
3. Department of Physics, Anurag University, Hyderabad, Telangana State 500 088, India
4. Department of Physics, JNTUH College of Engineering Jagtial, Nachupally (Kondagattu), Jagtial Dist, Telangana State 505 501, India