1. Centre of Excellence in Advanced Materials, National Institute of Technology, Durgapur-713209, WB, India
2. Department of Metallurgical and Materials Engineering, National Institute of Technology, Durgapur-713209, WB, India
3. Carbon Nanotechnology Laboratory, Department of Physics, National Institute of Technology, Durgapur-713209, WB, India
4. Department of Engineering and Innovation, The Open University, Milton Keynes, MK 76AA, U.K.