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首页> 外文期刊>RSC Advances >X-ray powder diffraction to analyse bimetallic core–shell nanoparticles (gold and palladium; 7–8 nm)
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X-ray powder diffraction to analyse bimetallic core–shell nanoparticles (gold and palladium; 7–8 nm)

机译：X射线粉末衍射分析双金属核壳纳米粒子（金和钯; 7-8 nm）

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A comparative X-ray powder diffraction study on poly( N -vinyl pyrrolidone) (PVP)-stabilized palladium and gold nanoparticles and bimetallic Pd–Au nanoparticles (both types of core–shell nanostructures) was performed. The average diameter of Au and Pd nanoparticles was 5 to 6 nm. The two types of core–shell particles had a core diameter of 5 to 6 nm and an overall diameter of 7 to 8 nm, i.e. a shell thickness of 1 to 2 nm. X-ray powder diffraction on a laboratory instrument was able to distinguish between a physical mixture of gold and palladium nanoparticles and bimetallic core–shell nanoparticles. It was also possible to separate the core from the shell in both kinds of bimetallic core–shell nanoparticles due to the different domain size and because it was known which metal was in the core and which was in the shell. The spherical particles were synthesized by reduction with glucose in aqueous media. After purification by multiple centrifugation steps, the particles were characterized with respect to their structural, colloid-chemical, and spectroscopic properties, i.e. particle size, morphology, and internal elemental distribution. Dynamic light scattering (DLS), differential centrifugal sedimentation (DCS), atomic absorption spectroscopy (AAS), ultraviolet-visible spectroscopy (UV-vis), high-angle annular dark field imaging (HAADF), and energy-dispersed X-ray spectroscopy (EDX) were applied for particle characterization.
机译：对聚（N-乙烯基吡咯烷酮）（PVP）稳定的钯和金纳米颗粒以及双金属Pd-Au纳米颗粒（两种类型的核-壳纳米结构）进行了比较X射线粉末衍射研究。 Au和Pd纳米颗粒的平均直径为5至6nm。两种核-壳颗粒的核直径为5至6 nm，总直径为7至8 nm，即壳厚度为1至2 nm。在实验室仪器上进行的X射线粉末衍射能够区分金和钯纳米粒子的物理混合物与双金属核壳纳米粒子。在两种双金属核-壳纳米颗粒中，由于畴尺寸的不同以及已知哪种金属在核中和哪种在壳中，也有可能将核与壳分离。通过在水性介质中用葡萄糖还原来合成球形颗粒。在通过多个离心步骤纯化后，就颗粒的结构，胶体化学和光谱性质，即粒度，形态和内部元素分布，对颗粒进行表征。动态光散射（DLS），微分离心沉降（DCS），原子吸收光谱（AAS），紫外可见光谱（UV-vis），高角度环形暗场成像（HAADF）和能量分散X射线光谱（EDX）用于颗粒表征。

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