1. Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology, Jais, Amethi, Uttar Pradesh 229304, India
2. Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu FI-90014, Finland
3. Department of Chemical & Biochemical Engineering, Rajiv Gandhi Institute of Petroleum Technology, Jais, Amethi, Uttar Pradesh 229304, India
4. Department of Physics, National Institute of Technology, Durgapur, West Bengal 713209, India