1. National Centre for Nanoscience and Nanotechnology, University of Mumbai, Kalina Campus, Santacruz (E), Mumbai 400098, India
2. Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
3. Thin Films and Devices Laboratory, School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded 431606, India