Glycine-assisted hydrothermal synthesis of pure and europium doped CeO2 nanoparticles and their structural, optical, photoluminescence, photocatalytic and antibacterial properties

This paper reports the structural, optical and antimicrobial study of Ce1−xFexO2−δ (0≤ x ≤20) nanoparticles (NPs) synthesized using a microwave-assisted hydrothermal method. The XRD pattern analysed using Rietveld refinement method clearly infers that all the samples exhibit single phase nature and exclude the possibility of an impurity phase. The lattice parameters and unit cell volume were found to decrease with an increase in Fe-doping content in CeO2 nanoparticles. The crystalline size determined using XRD pattern and TEM micrographs was found to decrease with Fe doping in CeO2. Selective area electron diffraction (SAED) pattern also demonstrated the crystalline nature of the Fe-CeO2 nanoparticles. Optical properties studied using UV–vis spectroscopy indicated that band gap decreased with an increase in Fe doping. The electrical properties have been investigated via dielectric constant, dielectric loss and AC conductivity. The dielectric constant was found to increase in the Fe-doped CeO2 nanoparticles, while AC conductivity was found to be reduced, which shows good dielectric behaviour of the Fe-doped CeO2 nanoparticles. The antibacterial activity of the synthesized NPs was achieved under ambient conditions with different bacteria, and the results showed that the properties were different for both bacteria. The antimicrobial activity reflects the possibility to develop Fe-doped CeO2 NPs as antibacterial agents against extensive microorganisms to control and prevent the spread and persistence of bacterial infections.

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Defects induced tailored optical and magnetic properties of Zn-doped CeO2 nanoparticles synthesized by a facile sol-gel type process

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.160149 ◽

2021 ◽

pp. 160149

Author(s):

B. Soni ◽

S. Makkar ◽

S. Biswas

Keyword(s):

Magnetic Properties ◽

Sol Gel ◽

Ceo2 Nanoparticles ◽

Type Process ◽

Optical And Magnetic Properties ◽

Doped Ceo2

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Biosynthesis of CeO2 Nanoparticles Using Egg White and Their Antibacterial and Antibiofilm Properties on Clinical Isolates

Crystals ◽

10.3390/cryst11060584 ◽

2021 ◽

Vol 11 (6) ◽

pp. 584

Author(s):

Shalendra Kumar ◽

Faheem Ahmed ◽

Nagih M. Shaalan ◽

Osama Saber

Keyword(s):

Bacterial Infections ◽

Antibacterial Properties ◽

Spherical Shape ◽

Inhibition Zone ◽

Egg White ◽

Ceo2 Nanoparticles ◽

Inorganic Materials ◽

Ambient Conditions ◽

Uniform Size ◽

Tem Analysis

Bio-inspired synthesis is a novel and attractive environmentally friendly route to generating inorganic materials. In this work, the preparation of CeO2 NPs using egg white and investigation of their antibacterial properties both in liquid and solid growth medium against Escherichia coli and Staphylococcus aureus bacteria were reported. The CeO2 nanoparticles were characterized using X-ray diffraction (XRD), Field emission transmission electron microscope (FETEM), UV-Vis, Raman, and antibacterial measurements. The results from XRD and TEM analysis showed that the prepared nanoparticles were a single phase in the nano regime (5–7 nm) with spherical shape and uniform size distribution. Optical properties reflected the characteristics peaks of CeO2 in the UV-Vis range with a bandgap ~2.80 eV. The antibacterial activity of the synthesized NPs was achieved under ambient conditions with different bacteria and the results showed that the properties were different for both the bacteria. The highest activity with an inhibition zone of about 22 mm against S. aureus was obtained as compared with the 19 mm zone of inhibition obtained with E.coli. This finding will be of major significance that indicates a possibility to develop CeO2 NPs as antibacterial agents against extensive microorganisms to control and prevent the spread and persistence of bacterial infections.

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