Solution plasma synthesis of bimetallic nanoparticles
Solution plasma synthesis of bimetallic nanoparticles
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DOI：
10.1088/0957-4484/25/13/135603
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发表时间：
2014-03
期刊：
影响因子：
3.5
通讯作者：
G. Saito;Yuki Nakasugi;T. Yamashita;T. Akiyama
中科院分区：
文献类型：
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作者：
G. Saito;Yuki Nakasugi;T. Yamashita;T. Akiyama
本文以金属合金丝为阴极，Pt丝为阳极，采用溶液等离子体法制备了Ni-Cu、Ni-Cr系固溶体合金、Sn-Pb系共晶合金、SnSb、Ni 3Sn系金属间化合物纳米粒子。在典型的工艺中，当在浸入电解质中的两个电极之间施加DC电压时，阴极通过电流的局部集中而熔化。本研究制备的Ni-Cu和Ni-Cr固溶体合金成分分布均匀。另一方面，共晶Sn-Pb合金的成分均匀性取决于电极的微观结构。采用小晶粒的淬火电极有利于形成富Sn相和富Pb相共存的Sn-Pb合金纳米颗粒。金属间化合物SnSb和Ni 3Sn合金纳米颗粒的形成伴随着胶体氧化物的形成。这些结果表明，溶液等离子体技术不仅适用于纯金属的合成，而且还可以用于各种合金纳米颗粒的合成。
This paper describes the facile solution plasma synthesis of bimetallic nanoparticles, including solid solution alloys (Ni–Cu and Ni–Cr system), eutectic alloys of Sn–Pb, and intermetallic alloys (SnSb and Ni3Sn), by using metallic alloy wire as the cathode and Pt wire as the anode. In the typical process, the cathode was melted by the local-concentration of current, upon applying a DC voltage between the two electrodes immersed in the electrolyte. The solid solution alloys of Ni–Cu and Ni–Cr prepared in this study have a uniform distribution of composition. On the other hand, the uniformity in the composition of the eutectic Sn–Pb alloy depends on the microstructure of the electrode. The use of quenched electrode with small crystal grains favors the formation of Sn–Pb alloy nanoparticles, in which the Sn-rich and Pb-rich phases coexist in each particle. The formation of intermetallic SnSb and Ni3Sn alloy nanoparticles is accompanied by the formation of colloidal oxide. These results demonstrate that the solution plasma technique is applicable not only for the synthesis of pure metals but can also be used for the synthesis of various alloy nanoparticles.