1. Nanobiotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India
2. Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India
3. Department of Electrical & Computer Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
4. Centre for Nanotechnology, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India