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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis of alloy AuCu nanoparticles with the L1(0) structure in an ionic liquid using sputter deposition
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Synthesis of alloy AuCu nanoparticles with the L1(0) structure in an ionic liquid using sputter deposition

机译：使用溅射沉积在离子液体中合成具有L1（0）结构的AuCu合金纳米颗粒

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摘要

Sputter deposition onto ionic liquids (ILs) was applied to synthesize AuCu bimetallic alloy nanoparticles (NPs) dispersed in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMI-BF4). A mixed target of Au and Cu materials was used for simultaneous sputter deposition onto the IL under an Ar pressure of 10 Pa. Two types of heating procedures within the range of 323-573 K were examined for control of the structures of NPs, particularly addressing the phase transition of the alloy NPs from the face centered cubic (fcc) structure to the L1(0) structure. One was heating after the sputter deposition in N-2 at atmospheric pressure for 1 h. Another was a combination of heating during the sputter deposition and subsequent heating under an Ar pressure from 0.5 to 0.8 Pa for 1 h. Although both cases exhibited lowering of the phase transition temperatures compared with the temperature for the bulk, the latter procedure at 423 K only provided the NPs (approx. 5 nm) consisting of the L1(0) structure in the dispersed manner. A mechanism for forming the L1(0) structure was proposed for explaining the difference between results obtained using the two procedures.
机译：溅射沉积到离子液体（ILs）上以合成分散在1-乙基-3-甲基咪唑四氟硼酸酯（EMI-BF4）中的AuCu双金属合金纳米颗粒（NPs）。使用金和铜材料的混合靶材在10 Pa的Ar压力下同时溅射沉积到IL上。检查了323-573 K范围内的两种加热程序，以控制NP的结构，特别是解决合金NPs从面心立方（fcc）结构到L1（0）结构的相变。一个是在溅射沉积在N-2下于大气压下加热1小时。另一个是在溅射沉积过程中加热和随后在0.5至0.8 Pa的Ar压力下加热1小时的组合。尽管两种情况都显示出相变温度与本体温度相比降低，但后者在423 K下的过程仅以分散方式提供了由L1（0）结构组成的NP（约5 nm）。提出了一种用于形成L1（0）结构的机制，以解释使用两种方法获得的结果之间的差异。

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