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Fabrication and characterization of nanoporous Ag–Pt alloy
Rare Metals ( IF 8.8 ) Pub Date : 2021-01-07 , DOI: 10.1007/s12598-020-01551-w
Tao Yin , Fan-Yun Meng , Min Zhang , Ying-Wei Yan

Nanoporous Ag–Pt bi-metallic alloy was fabricated by free dealloying of amorphous Ag-based precursor with the nominal composition of Ag 38.25 Pt 0.5 Cu 38.75 Si 22.5 . The noble Ag and Pt were left after the less noble Cu and Si dissolved in a certain acid solution. Bi-continuous nanoporous microstructure was formed with asymmetric ligaments and pores with typically 30–200 nm in width. The trace addition of Pt has refined the grains of the ligaments to the average size of less than 20 nm in the substrate and induced the formation of rods with nanopores. The morphologies of the rods were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) both in the form of clusters and as scattered individuals with characteristic length of several micrometers and diameter of tens of nanometers. The grains sizes in the rods were finer than those in the ligaments. The good mechanical integrity might be due to the combination of continuous ligaments and clusters of rods.

中文翻译:

纳米多孔银铂合金的制备与表征

纳米多孔银铂双金属合金是通过对标称成分为 Ag 38.25 Pt 0.5 Cu 38.75 Si 22.5 的无定形银基前驱体进行自由脱合金制备的。稀有的Cu和Si在一定的酸溶液中溶解后,剩下的是稀有的Ag和Pt。双连续纳米孔微结构形成有不对称的韧带和孔,宽度通常为 30-200 nm。Pt 的微量添加将基底中的韧带晶粒细化到小于 20 nm 的平均尺寸,并诱导形成具有纳米孔的杆。通过扫描电子显微镜(SEM)和透射电子显微镜(TEM)观察棒的形态,无论是簇状还是分散的个体,特征长度为几微米,直径为几十纳米。杆中的晶粒尺寸比韧带中的晶粒尺寸更细。良好的机械完整性可能是由于连续韧带和杆簇的组合。
更新日期:2021-01-07
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