UO2纳米粒子结构与性能关系的研究
Insight into the structure-property relation of UO2 nanoparticles
摘要：
在pH 8-11的还原条件下，通过铀（IV）的快速化学沉积制备了尺寸为2-3 nm的高度结晶的UO 2纳米颗粒（NPs）。然后通过显微镜和光谱技术表征颗粒，包括高分辨率透射电子显微镜（HRTEM）、X射线衍射（XRD）、在UM 4边缘处的高能分辨率荧光检测（HERFD）X射线吸收光谱和在UL 3边缘处的扩展X射线吸收精细结构（EXAFS）光谱。这项研究的结果表明，尽管U（IV）是新鲜制备的UO 2纳米颗粒的主要氧化态，但它们随着时间的推移和在X射线束下氧化为U4 O 9，表明U（IV）在这些条件下的高反应性。此外，发现纳米颗粒的氧化过程伴随着它们的尺寸增长到6 nm。我们在这里强调的主要区别和UO 2 NPs的性质与PuO 2，ThO 2和CeO 2 NPs的相似之处。
英文摘要：
Highly crystalline UO2 nanoparticles (NPs) with sizes of 2-3 nm were produced by fast chemical deposition of uranium(IV) under reducing conditions at pH 8-11. The particles were then characterized by microscopic and spectroscopic techniques including high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), high-energy resolution fluorescence detection (HERFD) X-ray absorption spectroscopy at the U M4 edge and extended X-ray absorption fine structure (EXAFS) spectroscopy at the U L3 edge. The results of this investigation show that despite U(IV) being the dominant oxidation state of the freshly prepared UO2 NPs, they oxidize to U4O9 with time and under the X-ray beam, indicating the high reactivity of U(IV) under these conditions. Moreover, it was found that the oxidation process of NPs is accompanied by their growth in size to 6 nm. We highlight here the major differences and similarities of the UO2 NPs properties with PuO2, ThO2 and CeO2 NPs.
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