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首页> 外文期刊>Advanced Functional Materials >Etching-Free Epitaxial Growth of Gold on Silver Nanostructures for High Chemical Stability and Plasmonic Activity
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Etching-Free Epitaxial Growth of Gold on Silver Nanostructures for High Chemical Stability and Plasmonic Activity

机译：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

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摘要

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.
机译：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，其中各向异性的相较于原始Ag纳米结构表现出优异的等离子体性能，同时显着增强稳定性。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纳米板具有实际上类似于Ag的显着的等离子体性能，这与Ag @ Au纳米球的等离子体活性比其Ag同行低得多的Ag @ Au纳米球形成鲜明对比。结果，它们在表面增强拉曼散射应用中显示出高耐久性和活性。该策略可以代表用于在较不稳定的金属纳米结构上沉积贵金属的通用平台，从而为功能金属纳米材料的合理设计提供了新的机会，从而可以广泛地应用。

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  • 来源
    《Advanced Functional Materials》 |2015年第34期|5435-5443|共9页
  • 作者

    Liu Hongpo; Liu Tingzhuo; Zhang Lei; Han Lu; Gao Chuanbo; Yin Yadong;

  • 作者单位

    Xi An Jiao Tong Univ, Ctr Mat Chem, Frontier Inst Sci & Technol, Xian 710054, Shaanxi, Peoples R China|Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710054, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, Ctr Mat Chem, Frontier Inst Sci & Technol, Xian 710054, Shaanxi, Peoples R China|Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710054, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, Ctr Mat Chem, Frontier Inst Sci & Technol, Xian 710054, Shaanxi, Peoples R China|Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710054, Shaanxi, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China;

    Xi An Jiao Tong Univ, Ctr Mat Chem, Frontier Inst Sci & Technol, Xian 710054, Shaanxi, Peoples R China|Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710054, Shaanxi, Peoples R China;

    Univ Calif Riverside, Dept Chem, Riverside, CA 92521 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    coinage metal nanoparticle; core; shell nanostructure; epitaxial growth; silver nanoplate; surface plasmon resonance;

    机译：造币金属纳米颗粒;核;壳纳米结构;外延生长;银纳米板;表面等离子体共振;

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