Synthesis of cerium oxide nanoparticles using Gloriosa superba L. leaf extract and their structural, optical and antibacterial properties

Mater Sci Eng C Mater Biol Appl. 2015 Apr:49:408-415. doi: 10.1016/j.msec.2015.01.042. Epub 2015 Jan 10.

Abstract

CeO2 nanoparticles (NPs) were green synthesized using Gloriosa superba L. leaf extract. The synthesized nanoparticles retained the cubic structure, which was confirmed by X-ray diffraction studies. The oxidation states of the elements (C (1s), O (1s) and Ce (3d)) were confirmed by XPS studies. TEM images showed that the NPs possessed spherical shape and particle size of 5nm. The Ce-O stretching bands were observed at 451cm(-1) and 457cm(-1) from the FT-IR and Raman spectra respectively. The band gap of the CeO2 NPs was estimated as 3.78eV from the UV-visible spectrum. From the photoluminescence measurements, the broad emission composed of eight different bands were found. The antibacterial studies performed against a set of bacterial strains showed that Gram positive (G+) bacteria were relatively more susceptible to the NPs than Gram negative (G-) bacteria. The toxicological behavior of CeO2 NPs was found due to the synthesized NPs with uneven ridges and oxygen defects in CeO2 NPs.

Keywords: Antibacterial activity; Cerium oxide nanoparticles; Gloriosa superba; Green synthesis; Raman spectroscopy; X-ray photoelectron spectroscopy.

MeSH terms

  • Anti-Bacterial Agents / pharmacology*
  • Cerium / chemistry*
  • Liliaceae / chemistry*
  • Microscopy, Electron, Transmission
  • Nanoparticles*
  • Plant Leaves / chemistry*
  • Spectrum Analysis
  • X-Ray Diffraction

Substances

  • Anti-Bacterial Agents
  • Cerium
  • ceric oxide