Facile EGCG assisted green synthesis of raspberry shaped CdO nanoparticles

For the first time, a green synthesis method was adopted for the preparation of raspberry shaped CdO nanoparticles (NPs) using extract of green tea leaves as a non-toxic and eco-friendly fuel. This simple and single-step method can be scaled up easily for large-scale synthesis. The CdO NPs were characterized by XRD, SEM, TEM, PL, UV-visible spectroscopy. The NPs were highly pure and well crystallized with an average particle size of 5-17 nm. The XRD indicated that all the samples were cubic in structure. Morphologies of the NPs were largely dependent on the concentration of green tea leaf extract. The optical properties were determined by DRS and PL spectra. Three emission peaks were recorded at 510, 527, 605 nm upon excited at 366 nm. The band gap was found to be 2.0 eV. The possible mechanism for the formation of raspberry shaped particles was discussed. This method exhibited excellent reproducibility of nanoparticles, without the use of any extra capping agent/stabilizing agent. It was economical and rapid for the preparation of CdO NPs with respect to energy, time and simplicity. (C) 2016 Elsevier B.V. All rights reserved.