1. Department of Electronics, Government Arts College, Kulithalai, Tamil Nadu, India
2. Department of Electronics, Government Arts College, Paramakudi, Tamil Nadu, India
3. Functional Materials Division, CSIR-Central Electrochemical Research Institute, Karaikudi, Tamil Nadu, India
4. Department of Physics, University College of Engineering – Bharathidasan Institute of Technology (BIT) campus, Anna University, Tiruchirappalli, Tamil Nadu, India
5. Department of Electronics, LRG Govt. Arts College (W), Tirupur, Tamil Nadu, India