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首页> 外文期刊>RSC Advances >Synthesis and biological characterization of alloyed silver–platinum nanoparticles: from compact core–shell nanoparticles to hollow nanoalloys
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Synthesis and biological characterization of alloyed silver–platinum nanoparticles: from compact core–shell nanoparticles to hollow nanoalloys

机译：合金化银-铂纳米粒子的合成与生物学表征：从致密的核壳纳米粒子到中空纳米合金

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Bimetallic nanoparticles consisting of silver and platinum were prepared by a modified seeded-growth process in water in the full composition range in steps of 10 mol%. The particles had diameters between 15–25 nm as determined by disc centrifugal sedimentation (DCS) and transmission electron microscopy (TEM). Whereas particles with high platinum content were mostly spherical with a solid silver core/platinum shell structure, mostly hollow alloyed nanoparticles were observed with increasing silver content. The internal structure and the elemental distribution within the particles were elucidated by high-resolution transmission electron microscopy (HRTEM) in combination with energy-dispersive X-ray spectroscopy (EDX). The particles were cytotoxic for human mesenchymal stem cells (hMSC) above 50 mol% silver. This was explained by dissolution experiments where silver was only released at and above 50 mol% silver. In contrast, platinum-rich particles (less than 50 mol% silver) did not release any silver ions. This indicates that the presence of platinum inhibits the oxidative dissolution of silver.
机译：由银和铂组成的双金属纳米粒子是通过改良的种子生长工艺在水中以10 mol％的步长在整个组成范围内制备的。通过圆盘离心沉降法（DCS）和透射电子显微镜（TEM）测定，颗粒的直径在15-25 nm之间。尽管具有高铂含量的颗粒大多为球形，具有固态银核/铂壳结构，但观察到大多数中空合金化纳米颗粒随银含量的增加而增加。通过高分辨率透射电子显微镜（HRTEM）结合能量色散X射线光谱（EDX）阐明了颗粒的内部结构和元素分布。所述颗粒对高于50mol％银的人间充质干细胞（hMSC）具有细胞毒性。这是通过溶解实验解释的，其中银仅以50摩尔％以上的银释放。相反，富含铂的颗粒（小于50摩尔％的银）不会释放任何银离子。这表明铂的存在抑制了银的氧化溶解。

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