1. Centre for Nanotechnology Research, Vellore Institute of Technology, Vellore, India
2. School of Advanced Sciences, Vellore Institute of Technology, Vellore, India
3. Dept. Of Physics, G. T. N. Arts College (Affiliated to Madurai Kamaraj University), Dindigul, India
4. Functional Nanomaterials & Devices Lab, Centre for Nanotechnology & Advanced Biomaterials and School of Electrical & Electronics Engineering, SASTRA Deemed to be University, Thanjavur, India