1. Advanced Materials and Chemical Characterization Division CSIR-Central Glass and Ceramic Research Institute Kolkata 700032 India
2. Functional Materials and Device Division CSIR-Central Glass and Ceramic Research Institute Kolkata 700032 India
3. Material Characterization and Instrumentation Division CSIR-Central Glass and Ceramic Research Institute Kolkata 700032 India
4. UGC-DAE Consortium for Scientific Research Bhabha Atomic Research Centre Mumbai 400085 India
5. Surface Physics and Material Science Division Saha Institute of Nuclear Physics Kolkata 700064 India
6. School of Materials Science and Nanotechnology Jadavpur University Kolkata 700032 India