1. Department of Physical Sciences, Indian Institute of Science Education and Research, Berhampur 760010, Odisha, India
2. Department of Electronic Science, Berhampur University, Odisha 760007, India
3. Centre of Excellence in Nano Sc. and Tech. for development of sensors, Berhampur University, Odisha 760007, India
4. Department of Physics, Berhampur University, Odisha 760007, India