CeO2纳米粒子的EPR研究,Materials Science Forum

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CeO2纳米粒子的EPR研究
Materials Science Forum Pub Date : 2022-01-04 , DOI: 10.4028/www.scientific.net/msf.1048.130
Dinesh Uthra ₁ , M.P. Sharma ₁

Affiliation

在本文中，我们研究了在700℃、850℃不同温度下煅烧的二氧化铈纳米粒子的EPR光谱、X射线衍射和拉曼分析、微观结构形貌，这些材料是通过Co沉淀（CPT）合成的。使用六水合三硝酸铈和碳酸钾溶液的方法。然后将合成的沉淀物在70℃下加热20小时。缓慢研磨沉淀物并在不同温度即煅烧3小时。700 °C 和 850 °C 形成细小的氧化铈粉末-二氧化铈纳米颗粒。EPR 测量使用连续波光谱仪（X 波段，Bruker Biospin EMX Plus）进行。g值是通过使用diphynelpirichylHydrageyl (DPPH-C18H12氮5氧6) 取样，得到g值约为1.97。当煅烧温度升高时，该g张量减小，EPR参数也随着煅烧温度升高而改变。当煅烧温度从700℃升高到850℃时，双峰分离，强度增加。X 射线衍射图显示了二氧化铈纳米颗粒晶体的性质，具有立方结构，在 700 °C 温度下煅烧的样品的晶格参数为 5.392 Å，在 850 °C 温度下煅烧的样品为 5.357 Å，显示出晶格参数随着温度的降低而减小的趋势。煅烧温度。拉曼峰的强度也随着温度的升高而向上移动。这种强度差异可能是由于在 700 °C 和 850 °C 的煅烧温度下颗粒尺寸 11.3± 1.0 增加至 15.6± 1.0 nm 以及峰 I 的拉曼峰导致最接近的相邻键的振动幅度增加。 , 461 厘米-1和峰值 II，463 厘米-1分别。在此拉曼图案中没有观察到其他峰。EDS 分析证实了合成样品中存在 Ce 和 O 原子。证实了球形和均匀分布的二氧化铈纳米颗粒以及相当的团聚趋势。

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EPR Study of CeO2 Nano Particles

In this paper, we have studied the EPR spectra, X-ray diffraction and Raman Analysis, Microstructures-morphology of the Ceria NPs calcined at different temperatures of 700 °C, 850 °C ,these materials have been synthesized by Co precipitation (CPT) method by using Cerium tri-nitrate hexahydrate and potassium carbonate solutions. Then synthesized precipitate was heated at 70 °C for 20 hour. Slow grinding of the precipitate and calcined for 3 hours at different temperatures viz. 700 °C and 850 °C to form fine Cerium oxide powder-Ceria NPs. The EPR measurements were made using continuous wave spectrometer (X-band, Bruker Biospin EMX Plus). The g values were obtained by using diphynelpirichylhydrageyl (DPPH-C18H12N5O6) sample and got g value is around 1.97. This g tensor is decreased when the calcined temperature are increased, EPR parameters are also changed as the calcined temperature increases. When the calcined temperature is increased from 700 °C to 850 °C, a doublet separated, intensity increased. The X-Ray diffraction pattern shows the nature of the Ceria NPs crystal, with a cubic structure and got the lattice parameters 5.392 Å for samples calcined at temperature of 700 °C and 5.357 Å at 850 °C which shows decreasing trend in lattice parameter with calcination temperature. The intensity of Raman peaks is also shifted upwards with a rise in temperature. This intensity difference could be because of the rise in vibrational amplitudes of the closest neighboring bonds because of the increase in particle size 11.3± 1.0 to 15.6± 1.0 nm at calcination temperatures of 700 °C and 850 °C and the Raman peak of peak I, 461 cm-1 and peak II, 463 cm-1 respectively. Other peaks were not observed in this Raman pattern. The EDS analysis confirms the presence of the Ce and O atoms in the synthesized samples. Spherical shapes and homogeneously distributed Ceria NPs and a rather tendency for agglomeration were confirmed.

更新日期：2022-01-04

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