1. DST Unit of Nanoscience and Thematic Unit of Excellence, Department of Chemistry, Indian Institute of Technology, Chennai 600036, India
2. Department of Chemical Engineering, Indian Institute of Technology, Chennai 600036, India
3. Department of Electrical Engineering, Indian Institute of Technology, Chennai 600036, India
4. International Centre for Clean Water, IIT Madras Research Park, 2nd Floor, B-Block, Kanagam Road, Taramani, Chennai 600113, India