1. Division of Materials and Environmental Chemistry, Stockholm University, Frescativägen 8, 10691 Stockholm, Sweden
2. Chemistry and Chemical Engineering, Chalmers University of Technology, Kemigarden 4, SE-41296 Gothenburg, Sweden
3. International and Inter University Centre for Nanoscience and Nanotechnology (IIUCNN), M.G. University, 686560 Kottayam, Kerala