Aerosol Synthesis of High Entropy Alloy Nanoparticles
Aerosol Synthesis of High Entropy Alloy Nanoparticles
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DOI：
10.1021/acs.langmuir.9b03392
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发表时间：
2020-03-03
期刊：
影响因子：
3.9
通讯作者：
Zachariah, Michael R.
中科院分区：
文献类型：
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作者：
Yang, Yong;Song, Boao;Zachariah, Michael R.
在单个颗粒中均匀混合多种金属元素可以提供新的材料特性功能。高熵合金(HEA)名义上定义为含有五种或五种以上混合良好金属元素的结构，目前正在探索纳米级的结构，但实现其工业应用的放大是一个极具挑战性的问题。在这里，我们报告了一种气溶胶液滴介导的技术，通过不相容的金属元素的原子级混合来实现HEA纳米颗粒的可伸缩合成。金属盐的水溶液被雾化以产生类似1微米的气溶胶液滴，当受到快速加热/淬灭时，导致前体分解和零价金属原子冻结。原子级分辨扫描电子显微镜和能谱分析表明，纳米粒子中的所有金属元素在原子水平上是均匀混合的。我们相信，这种方法提供了一种简单而灵活的气溶胶液滴介导的合成技术，最终将使从颗粒HEA开始的批量处理成为可能。
Homogeneously mixing multiple metal elements within a single particle may offer new material property functionalities. High entropy alloys (HEAs), nominally defined as structures containing five or more well-mixed metal elements, are being explored at the nanoscale, but the scale-up to enable their industrial application is an extremely challenging problem. Here, we report an aerosol droplet-mediated technique toward scalable synthesis of HEA nanoparticles with atomic-level mixing of immiscible metal elements. An aqueous solution of metal salts is nebulized to generate similar to 1 mu m aerosol droplets, which when subjected to fast heating/quenching result in decomposition of the precursors and freezing-in of the zero-valent metal atoms. Atomic-level resolution scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy analysis reveals that all metal elements in the nanoparticles are homogeneously mixed at the atomic level. We believe that this approach offers a facile and flexible aerosol droplet-mediated synthesis technique that will ultimately enable bulk processing starting from a particulate HEA.