1. Sensor Devices & Metrology Group, CSIR-National Physical Laboratory (CSIR-NPL), Dr K. S. Krishnan Road, New Delhi 110012, India
2. Academy of Scientific & Innovative Research, (AcSIR), CSIR-HRDC Campus, Ghaziabad, Uttar Pradesh 201002, India
3. Functional Materials and Microsystems Research Group and the Micro Nano Research Facility, RMIT University, Melbourne 3000, Australia
4. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC
5. Solid State Physics Laboratory, Lucknow Road, Timarpur, Delhi 110054, India