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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芯壳纳米粒子（金和钯; 7-8nm）

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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：进行对比较X射线粉末衍射研究（N-乙烯基吡咯烷酮）（PVP） - 氧化钯和金纳米颗粒和双金属PD-Au纳米颗粒（两种类型的核 - 壳纳米结构）。 Au和Pd纳米粒子的平均直径为5至6nm。两种类型的核 - 壳颗粒的芯直径为5至6nm，总直径为7至8nm，即壳厚度为1至2nm。在实验室仪器上的X射线粉末衍射能够区分金和钯纳米颗粒的物理混合物和双金属芯壳纳米颗粒。由于不同的结构域尺寸，也可以将芯从两种双金属核 - 壳纳米粒子中分离在两种双金属核 - 壳纳米粒子中，并且因为已知在核中是哪种金属并且在壳中。通过用含水介质中的葡萄糖还原来合成球形颗粒。通过多种离心步骤纯化后，表征其结构，胶体化学品和光谱性质，即粒度，形态和内部元素分布。动态光散射（DLS），差分离心沉降（DCS），原子吸收光谱（AAS），紫外线可见光谱（UV-VI），高角度环形暗场成像（HAADF）和能量分散的X射线光谱（EDX）施用于颗粒表征。

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    《RSC Advances》 |2019年第46期|共9页
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  • 正文语种 eng
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