1. Materials Research Laboratory, Department of Chemistry, National Institute of Technology Calicut, Kozhikode 673601, Kerala, India
2. Department of Chemistry, Government Engineering College Wayanad, Wayanad 670644, Kerala, India
3. Department of Chemistry, National University of Singapore, 3 Science Drive-3, Singapore 117543, Singapore
4. Center for Nanotechnology and Sustainability, Department of Mechanical Engineering, College of Design and Engineering, National University of Singapore, 9 Engineering Drive-1, Singapore 117575, Singapore