Multifunctional Properties of Ocimum sanctum Linn Leaves Mediated Synthesis of Nanoceria

Abstract

For the first time, CeO2 nanoparticles (NPs) were synthesized via green solution combustion method using Ocimum sanctum Linn (Tulsi) leaves extract as a reducing agent. The as-formed and calcined (500∘C for 3[Formula: see text]h) CeO2 NPs were characterized with different techniques. The Bragg reflections clearly indicate that the formation of cubic fluorite structure with crystallite size was found to be 10[Formula: see text]nm. The surface morphology of as-formed and calcined sample is made up of large number of irregular shaped NPs. However, agglomeration of the NPs is more in calcined sample. The estimated direct energy band gap from Tauc’s relation was found to be 2.92[Formula: see text]eV and 2.87[Formula: see text]eV for the as-formed and calcined sample, respectively. Photoluminescence spectra, CIE and CCT values clearly indicate that the present nanophosphor might find an application in display technology. Antifungal and anticancer studies show that CeO2 NPs are noncytotoxic against fungus and cancerous cells. Whereas, electrochemical studies show that the synthesized CeO2 NPs show redox peaks and pseudo capacitance and hence it finds importance in supercapacitor applications.