Dr. Rakesh Kumar Sonker received his Ph.D. in 2016 from the Department of Applied Physics, Babasaheb Bhimrao Ambedkar University, Lucknow, India. Currently, he is Assistant Professor in the Department of Physics, Acharya Narendra Dev College, University of Delhi, India. His research interests are in the synthesis of functional 2D/3D nanomaterials, metal oxides nanoparticles, nanoporous materials, metallopolymers, characterizations, energy storage devices, and sensor applications. Prof. Kedar Singh received his Ph.D. in Physics from the University of Rajasthan, Jaipur, India. Subsequently, he joined the Department of Physics, Institute of Technology, Banaras Hindu University, Varanasi, as Assistant Professor. Currently he is Professor of Physics and Dean, School of Physical Sciences, Jawaharlal Nehru University, Delhi, India. His research interests are in condensed matter physics, magnetic nanomaterials, thermoelectric materials and semiconducting thin films, gas/ biosensors, DMS-quantum dots, core-shell materials, plasmonic nanocrystals, chalcogenide glasses and their nanocomposites for energy applications, etc. Prof. Rajendra Sonkawade received his Ph.D. in Physics from the Hemwati Nandan Bahuguna University, Srinagar (Garhwal), Uttarakhand, India. Currently, he is working as Professor in the Department of Physics, Shivaji University, Kolhapur, Maharashtra, India. His research interests are in metal oxide thin films and nanostructures for gas sensing, radiation physics, supercapacitors, polymer science, etc.