**Author details**

Sheela Devi1 \*, Venus Dillu2 and Mekonnen Tefera Kebede3

1 Department of Applied Sciences, Maharaja Surajmal Institute of Technology, New Delhi, India

2 Departement of Physics, Sharda University, School of Basic Science and Research, Greater Noida, UP, India

3 Departement of Physics (Nanotechnology), Sharda University, School of Basic Science and Research, Greater Noida, UP, India

\*Address all correspondence to: physics.sheela@gmail.com

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