1. Department of Chemistry, Institute of Basic Science, Bundelkhand University, Jhansi, Uttar Pradesh 284128, 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
4. Advanced Carbon Products Sub Division, Advanced Materials and Device Metrology Division, CSIR-National Physical Laboratory, New Delhi 110012, India