氧化铈
铈
X射线光电子能谱
拉曼光谱
纳米颗粒
材料科学
微晶
硝酸铈
氧化物
核化学
吸收光谱法
分析化学(期刊)
化学
纳米技术
化学工程
有机化学
光学
物理
工程类
冶金
作者
Nicuşor Fifere,Rodinel Ardeleanu,Florica Doroftei,Marius Dobromir,Anton Airinei
摘要
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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