CAN v3i1 2020.pdf Characterization and Application of Nanomaterials (2020) Volume 3 Issue 1 Review Article 1Center for Advanced Research in Renewable Energy and Sensor Technology, Meghnad Saha Institute of Technology, Kolkata 700150, India. Email: sukhendu123@gmail.com 2Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur 713212, India. 3Centre of Excellence for Green Energy and Sensor System, Indian Institute of Engineering Science and Technology, Shibpur 713212, India. Keywords: et al. et al et al et al et al. et al. et al. et al . et al et al. et al. et al. et al. et al. et al. et al. et al. et al . et al. et al. et al. et al. et al. et al. et al. et al. et al . et al. et al. et al. et al et al. et al. et al. et al. et al. et al et al. et al. et al. et al. et al. et al. et al. et al. et al. et al. et al et al. et al. et al. et al et al. et al. et al et al. et al. et al. et al. et al. et al. et al. et al. et al. et al. et al. et al. et al. et al. et al.