Abstract

Palladium nanoparticles have been synthesized in an aqueous medium by ultraviolet irradiation using complex palladium oxalate as a precursor. The samples were studied by various laboratory methods, including transmission electron microscopy, X-ray fluorescence analysis, X-ray powder diffraction, X-ray absorption fine structure spectroscopy, and diffuse reflectance infrared spectroscopy with the use of CO probe molecules. The microimages obtained by transmission electron microscopy did not allow us to distinguish Pd nanoparticles from the material of the substrate but do not show any effect of ultraviolet irradiation on the sizes of CeO₂ nanoparticles. The X-ray fluorescence analysis data show the presence of cerium and palladium atoms in the material. X-ray diffraction patterns indicate the presence of phases of cerium dioxide and metallic palladium, while the analysis of the X-ray absorption fine structure spectra beyond the K-edge of palladium shows the presence of the PdO phase in the system. The approximate size of the palladium nanoparticles was estimated by the infrared spectra after the adsorption of CO and is less than 2 nm, which is significantly smaller than the average size of Pd nanoparticles obtained by a similar method without a CeO₂ substrate (1.5–9.5 nm).

中文翻译：

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紫外辐射作用下氧化铈表面钯纳米粒子的合成及其表征

摘要

钯纳米颗粒已经通过使用复合草酸钯作为前体的紫外线辐射在水性介质中合成。通过各种实验室方法对样品进行了研究，包括透射电子显微镜，X射线荧光分析，X射线粉末衍射，X射线吸收精细结构光谱和使用CO探针分子的漫反射红外光谱。通过透射电子显微镜获得的显微图像不能使我们从基材的材料中区分出Pd纳米颗粒，但是没有显示出紫外线对CeO ₂尺寸的任何影响。纳米粒子。X射线荧光分析数据表明材料中存在铈和钯原子。X射线衍射图表明存在二氧化铈和金属钯相，而对超过钯K边缘的X射线吸收精细结构光谱的分析表明系统中存在PdO相。钯纳米颗粒的大约尺寸是由一氧化碳吸附后的红外光谱估算得出的，小于2 nm，远小于通过类似方法在没有CeO ₂衬底的情况下获得的钯纳米颗粒的平均尺寸（1.5-9.5）。 nm）。