Leucas aspera mediated multifunctional CeO2 nanoparticles: Structural, photoluminescent, photocatalytic and antibacterial properties

Spectrochim Acta A Mol Biomol Spectrosc. 2015:149:452-62. doi: 10.1016/j.saa.2015.04.073. Epub 2015 Apr 30.

Abstract

Spherical shaped cerium dioxide (CeO2) nanoparticles (NPs) were synthesized via bio mediated route using Leucas aspera (LA) leaf extract. The NPs were characterized by PXRD, SEM, UV-Visible techniques. Photoluminescence (PL), photocatalysis and antibacterial properties of NPs were studied. PXRD patterns and Rietveld analysis confirm cubic fluorite structure with space group Fm-3m. SEM results evident that morphology of the NPs was greatly influenced by the concentration of LA leaf extract in the reaction mixture. The band gap energy of the NPs was found to be in the range of 2.98-3.4 eV. The photocatalytic activity of NPs was evaluated by decolorization of Rhodamine-B (RhB) under UVA and Sun light irradiation. CeO2 NPs show intense blue emission with CIE coordinates (0.14, 0.22) and average color coordinated temperature value ∼148,953 K. Therefore the present NPs quite useful for cool LEDs. The superior photocatalytic activity was observed for CeO2 NPs with 20 ml LA under both UVA and Sunlight irradiation. The enhanced photocatalytic activity and photoluminescent properties were attributed to defect induced band gap engineered CeO2 NPs. Further, CeO2 with 20 ml LA exhibit significant antibacterial activity against Escherichia coli (EC) and Staphylococcus aureus (SA). These findings show great promise of CeO2 NPs as multifunctional material for various applications.

Keywords: Antibacterial activity; CeO(2) NPs; Leucas aspera; Photocatalysis; Photoluminescence.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anti-Bacterial Agents / chemistry*
  • Anti-Bacterial Agents / pharmacology*
  • Catalysis
  • Cerium / chemistry*
  • Cerium / pharmacology*
  • Escherichia coli / drug effects
  • Escherichia coli Infections / drug therapy
  • Fluorescent Dyes / chemistry
  • Humans
  • Lamiaceae / chemistry
  • Light
  • Luminescence
  • Nanoparticles / chemistry*
  • Nanoparticles / ultrastructure
  • Particle Size
  • Photolysis
  • Plant Extracts / chemistry
  • Rhodamines / chemistry
  • Staphylococcal Infections / drug therapy
  • Staphylococcus aureus / drug effects

Substances

  • Anti-Bacterial Agents
  • Fluorescent Dyes
  • Plant Extracts
  • Rhodamines
  • Cerium
  • ceric oxide
  • rhodamine B