1. Department of Chemistry, Birla Institute of Technology and Science, Hyderabad Campus, Hyderabad 500078, India
2. Department of Electronics and Electrical Engineering, Birla Institute of Technology and Science, Hyderabad Campus, Hyderabad 500078, India
3. Sensors and Nano Electronics (SANE) Lab, School of Applied Engineering and Technology, Southern Illinois University Carbondale, Illinois - 62901, USA
4. Materials Center for Sustainable Energy & Environment (McSEE), Birla Institute of Technology and Science, Hyderabad Campus, Hyderabad 500078, India