Paveena Laokul

Structure and optical properties of CeO2 nanoparticles prepared by using lemongrass plant extract solution

The synthesis and optical properties of cerium oxide (CeO2) nanoparticles by a simple, cost-effective and environment-friendly method using cerium(III) acetate hydrate and lemongrass plant extract. The CeO2 nanoparticles having sizes of 10–40 nm were obtained by calcining the precursors in air at 400, 500, and 600 °C, for 2 h. Results from X-ray diffraction (XRD), and Raman spectroscopy indicated that the synthesized CeO2 nanoparticles have the fluorite structure of the bulk CeO2 samples. The PL intensity of CeO2 increases with increasing calcination temperature. The CeO2 sample calcined at 600 °C shows a stronger emission spectrum than the CeO2 samples calcined at 400 and 500 °C, suggesting its better crystalline and optical properties than the other samples.

Ni-Cu-Zn ferrite prepared by aloe vera plant extract or egg white

ions at octahedral sites [2]. It was suggested recently that some Zn, Ni and Cu ferrites offer superior magnetic properties depending on certain concentration of Ni, Cu, Zn in the ferrites [3]. The present study reports on the effects of Zn, Ni, and Cu concentrations on the structural and magnetic properties of the ferrites prepared by simple, cost-effective, non-toxic sol-gel methods. In this study, either Zn(NO