Petru Poni Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania.
Department of Exact and Natural Sciences, Institute of Interdisciplinary Research, Alexandru Ioan Cuza University of Iasi, 11 Carol I Blvd., 700506 Iasi, Romania.
Int J Mol Sci. 2023 May 17;24(10):8917. doi: 10.3390/ijms24108917.
Cerium oxide nanoparticles were obtained using aqueous extracts of and . X-ray diffractometry analysis confirmed the crystalline structure of the synthesized cerium oxide nanoparticles calcined at 600 °C. Scanning electron microscopy, UV-Vis reflectance and Raman spectroscopy, XPS, and fluorescence studies were utilized to interpret the morphological and optical properties of these nanoparticles. The STEM images revealed the spherical shape of the nanoparticles and that they were predominantly uniform in size. The optical band gap of our cerium nanoparticles was determined to be 3.3 and 3.0 eV from reflectance measurements using the Tauc plots. The nanoparticle sizes evaluated from the Raman band at 464 cm due to the F2g mode of the cubic fluorite structure of cerium oxide are close to those determined from the XRD and STEM data. The fluorescence results showed emission bands at 425, 446, 467, and 480 nm. The electronic absorption spectra have exhibited an absorption band around 325 nm. The antioxidant potential of the cerium oxide nanoparticles was estimated by DPPH scavenging assay.
氧化铈纳米粒子是通过 和 的水提物获得的。X 射线衍射分析证实了在 600°C 下煅烧的合成氧化铈纳米粒子的晶体结构。扫描电子显微镜、紫外-可见反射和拉曼光谱、X 射线光电子能谱和荧光研究用于解释这些纳米粒子的形态和光学性质。STEM 图像显示纳米粒子呈球形，并且大小主要均匀。通过使用 Tauc 图从反射率测量确定我们的铈纳米粒子的光学带隙为 3.3 和 3.0 eV。由于氧化铈立方萤石结构的 F2g 模式，在 464 cm 处的拉曼带评估的纳米颗粒尺寸接近从 XRD 和 STEM 数据确定的尺寸。荧光结果显示在 425、446、467 和 480nm 处有发射带。电子吸收光谱在 325nm 左右显示出一个吸收带。通过 DPPH 清除测定法评估了氧化铈纳米粒子的抗氧化潜力。
