1. Department of Chemistry, Institute of Basic Science, Bundelkhand University, Jhansi 284128, Uttar Pradesh, India
2. Photonic Materials Metrology Sub Division, Advanced Materials and Device Metrology Division, CSIR-National Physical Laboratory, New Delhi 110012, India
3. Force and Hardness Metrology Sub Division, Physico-Mechanical Metrology Division, CSIR-National Physical Laboratory, New Delhi 110012, India