Cerium-doped hydroxyapatite nanoparticles synthesized by the co-precipitation method
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Abstract
The present work reports a simple adapted co-precipitation method for the synthesis of stable Ce-substituted Ca hydroxyapatite (HAp) nanoparticles. The structural and morphological properties of the Ce-doped hydroxyapatite (Ce:HAp) were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX). The optical properties of the Ce-doped hydroxyapatite were also investigated using Fourier transform infrared (FTIR) spectroscopy, Fourier transform Raman spectroscopy and photoluminescence analysis. The results of the XRD studies revealed the progressive increase in the a- and c-axes with increasing Ce concentration. In the FTIR studies of Ce:HAp powders, a structure similar to that of hydroxyapatite was observed. The IR and Raman wavenumbers and the peak strengths of the bands associated with the P–O and O–H bonds decreased progressively with increasing Ce concentration. All the emission maxima could be attributed to 5d–4f transitions of the Ce ions. The displacements of the maximum emission bands with increasing Cerium in the samples were in agreement with the results obtained by XRD studies. The Ce:HAp samples with xCe = 0.03 and 0.05 exhibited significant antibacterial activity against Staphylococcus aureus and Escherichia coli bacterial strains compared to Ce:HAp samples with xCe = 0 (pure HAp) and 0.01.
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[1]
C. S. Ciobanu, C. L. Popa, and D. Predoi, “Cerium-doped hydroxyapatite nanoparticles synthesized by the co-precipitation method”, J. Serb. Chem. Soc., vol. 81, no. 4, pp. 433–446, May 2016.
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