1. Department of Physics, Bharathidasan University, Tiruchirappalli, India
2. Department of Material Science and Technology, University of Ruse Angel Kanchev, Ruse, Bulgaria
3. Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand
4. Department of Physics, Tagore Engineering College, Chennai, India
5. Department of Physics, Dhanalakshmi Srinivasan Arts and Science College, Chennai, India
6. Department of Microbiology, K. R. College of Arts and Science, Kovilpatti, India