Abstract
GREEN SYNTHESIS OF PURE ZnO AND La DOPED ZnO NANOPARTICLES AND THEIR STRUCTURAL, OPTICAL AND ANTIBACTERIAL STUDIES

M. Karthikeyan, A. Jafar Ahamed*, P. Vijayakumar and C. Karthikeyan

ABSTRACT

Zinc oxide (ZnO) and La doped ZnO nanoparticles (NPs) were successfully synthesized by green method through Gymnema sylvestre plant leaf extract. The synthesized ZnO and La doped ZnO NPs have been characterized by XRay diffraction (XRD), UV–vis spectroscopy, Fourier transform infra-red (FT-IR) spectroscopy, Field emission scanning electron microscopy (FESEM) and Elemental analysis (EDAX). The ZnO and La doped ZnO nanoparticles were found to be crystalline having a single phase as confirmed by XRD and FESEM. It has been observed that the increase in the concentration of La from 0.01M to 0.03M in ZnO increases the crystallite size from 38 to 42 nm and accordingly its band gap varies from 2.7 to 2.8 eV. After treatment morphology of materials was changed from hexagonal shaped. Besides, this study determines the antibacterial efficiency of the synthesized ZnO and La doped ZnO NPs against G+ bacteria (S. aureus, S.pnemonia) and G- bacteria (K. pneumonia, E. coli).

Keywords: Zinc Oxide, Gymnema sylvestre, Nanoparticles, La doped ZnO, antibacterial.


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