1. Centre for Materials Science and Nanotechnology, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Majhitar, 737136, East Sikkim, India
2. Department of Metallurgical and Materials Engineering, National Institute of Technology Durgapur, Durgapur 713209, India
3. Department of Physics, National Institute of Technology, Manipur, Langol 795004, Manipur, India
4. Department of Chemistry, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Majhitar, 737136, East Sikkim, India