Etching‐Free Epitaxial Growth of Gold on Silver Nanostructures for High Chemical Stability and Plasmonic Activity,Advanced Functional Materials

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Etching‐Free Epitaxial Growth of Gold on Silver Nanostructures for High Chemical Stability and Plasmonic Activity
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2015-08-06 , DOI: 10.1002/adfm.201502366
Hongpo Liu _{1,

2} , Tingzhuo Liu _{1,

2} , Lei Zhang _{1,

2} , Lu Han ₃ , Chuanbo Gao _{1,

2} , Yadong Yin ₄

Affiliation

A robust method for epitaxial deposition of Au onto the surface of Ag nanostructures is demonstrated, which allows effective conversion of Ag nanostructures of various morphologies into Ag@Au counterparts, with the anisotropic ones showing excellent plasmonic properties comparable to the original Ag nanostructures while significantly enhanced stability. Sulfite plays a determining role in the success of this epitaxial deposition as it strongly complexes with gold cations to completely prevent galvanic replacement while it also remains benign to the Ag surface to avoid any ligand‐assisted oxidative etching. By using Ag nanoplates as an example, it is shown that the corresponding Ag@Au nanoplates possess remarkable plasmonic properties that are virtually Ag‐like, in clear contrast to Ag@Au nanospheres that exhibit much lower plasmonic activities than their Ag counterparts. As a result, they display high durability and activities in surface‐enhanced Raman scattering applications. This strategy may represent a general platform for depositing a noble metal on less stable metal nanostructures, thus opening up new opportunities in rational design of functional metal nanomaterials for a broad range of applications.

中文翻译：

金在银纳米结构上的无蚀刻外延生长，具有高化学稳定性和等离子体活性

证明了一种将Au外延沉积到Ag纳米结构表面上的稳健方法，该方法可以将各种形态的Ag纳米结构有效地转化为Ag @ Au对应物，各向异性的同质材料具有与原始Ag纳米结构相当的出色的等离子体性能，同时显着增强了稳定。亚硫酸盐在这种外延沉积的成功过程中起着决定性的作用，因为它与金阳离子紧密络合以完全防止电置换，同时它对Ag表面也保持良性，以避免任何配体辅助的氧化蚀刻。以Ag纳米板为例，表明相应的Ag @ Au纳米板具有显着的等离子体性质，实际上类似于Ag，与Ag @ Au纳米球形成鲜明对比的是，后者的等离子体活性比Ag纳米球低得多。因此，它们在表面增强的拉曼散射应用中显示出很高的耐久性和活性。该策略可能代表了在较不稳定的金属纳米结构上沉积贵金属的通用平台，从而为功能性金属纳米材料的合理设计提供了新的机会，从而可广泛应用。

更新日期：2015-08-06

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