Tailoring the Structural and Optical Properties of Cerium Oxide Nanoparticles Prepared by an Ecofriendly Green Route Using Plant Extracts

International Journal of Molecular Sciences Pub Date : 2024-01-04 DOI:10.3390/ijms25010681

N. Fifere, R. Ardeleanu, F. Doroftei, Marius Dobromir, A. Airinei

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Abstract

The present study explores an environmentally friendly green approach to obtain cerium oxide nanoparticles via a biomediated route using Mellisa officinalis and Hypericum perforatum plant extracts as reducing agents. The as-prepared nanoparticles were studied for their structural and morphological characteristics using XRD diffractometry, scanning electron microscopy, Raman, fluorescence and electronic absorption spectra, and X-ray photoelectron spectroscopy (XPS). The XRD pattern has shown the centered fluorite crystal structure of cerium oxide nanoparticles with average crystallite size below 10 nm. These observations were in agreement with the STEM data. The cubic fluorite structure of the cerium oxide nanoparticles was confirmed by the vibrational mode around 462 cm−1 due to the Ce-08 unit. The optical band gap was estimated from UV-Vis reflectance spectra, which was found to decrease from 3.24 eV to 2.98 eV. A higher specific area was determined for the sample using M. officinalis aqueous extract. The EDX data indicated that only cerium and oxygen are present in the green synthesized nanoparticles.

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利用植物提取物以生态友好的绿色方法制备氧化铈纳米粒子并定制其结构和光学特性

本研究探索了一种环境友好型的绿色方法，即使用麦丽莎和贯叶连翘植物提取物作为还原剂，通过生物媒介途径获得氧化铈纳米粒子。利用 X 射线衍射仪、扫描电子显微镜、拉曼光谱、荧光光谱、电子吸收光谱和 X 射线光电子能谱（XPS）研究了制备的纳米粒子的结构和形态特征。X 射线衍射图显示了氧化铈纳米粒子的中心萤石晶体结构，平均结晶尺寸低于 10 纳米。这些观察结果与 STEM 数据一致。氧化铈纳米粒子的立方萤石结构通过 Ce-08 单元在 462 cm-1 附近的振动模式得到了证实。根据紫外可见反射光谱估算出的光带隙从 3.24 eV 减小到 2.98 eV。使用 M. officinalis 水提取物的样品的比表面积更高。EDX 数据表明，绿色合成纳米粒子中只存在铈和氧。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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International Journal of Molecular Sciences

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