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首页> 外文期刊>Nanotechnology >Controllable corrosion-assisted fabrication of Au-Ag alloyed hollow nanocrystals for highly efficient and environmentally-stable SERS substrates
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Controllable corrosion-assisted fabrication of Au-Ag alloyed hollow nanocrystals for highly efficient and environmentally-stable SERS substrates

机译：用于高效和环保稳定的SERS基材的Au-Ag合金中空纳米晶体的可控腐蚀辅助制造

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摘要

Surface enhanced Raman scattering (SERS) substrates with both high activity and long term chemical-stability have been expected in the practical application of the SERS-based detection. In this paper, Au-Ag bimetal nanocrystals are fabricated based on the template-etching reaction in the Ag nanocubes-contained cetylpyridinium chloride (CPC) aqueous solution via adding the HAuCl4 solution. The obtained nanocrystals are Au-Ag alloyed and hollow in structure. Further, it has been found that with the increasing Au/Ag molar ratio, the shape of the alloyed nanocrystals evolve from the truncated nanocubes to the hollow boxes and then nanocages, showing the ever red-shifting surface plasmon resonance from the visible to the infrared region. The formation of the alloyed hollow nanocrystals is attributed to the preferential dissolution of the Ag nanocubes induced by CPC selective adsorption and the three to one galvanic replacement reaction between Ag and Au atoms. Importantly, such Au-Ag alloyed hollow nanocrystals, especially the ones with a low Au/Ag atomic ratio, show both high SERS activity and long term environmental stability compared with pure Ag or Au nanocrystals, and are the ideal candidate for the SERS substrate with practical application value. This work not only demonstrates the nanofabrication route to the alloyed hollow nanocrystals with controllable shapes and tunable optical properties in a large region, but also presents highly active and chemically-stable SERS substrates for the practical SERS-based detection.
机译：在基于SERS的检测的实际应用中，已经预期了表面增强的拉曼散射（SERS）基材，其具有高活性和长期化学稳定性。在本文中，通过添加HauCl4溶液，基于Ag纳米甲基吡啶吡啶（CPC）水溶液中的模板蚀刻反应来制造Au-Ag双金属纳米晶。所得纳米晶体是Au-Ag的合金化和中空的结构。此外，已经发现，随着Au / Ag摩尔比的增加，合金纳米晶体的形状从截短的纳米内容从截短的纳米内切换到中空箱，然后纳米记录，从而显示出从可见的红外线的红色移位表面等离子体共振地区。合金化中空纳米晶体的形成归因于CPC选择性吸附和Ag和Au原子之间的三到一种电催化反应的Ag纳米孔的优先溶解。重要的是，与纯Ag或Au纳米晶体相比，这种Au-Ag合金中空纳米晶体，尤其是具有低Au / Ag原子比的含量低，表现出高分子活性和长期的环境稳定性，并且是SERS基板的理想候选者实际应用价值。这项工作不仅示出了具有可控形状和在大区域中可控形状和可调谐光学性质的合金空心纳米晶体的纳米制备途径，而且还呈现出高度活性和化学稳定的SERS基板，用于实际的基于SERS的检测。

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  • 来源
    《Nanotechnology》 |2018年第45期|共9页
  • 作者

    Guo Jing; Lu Fang; Zhang Yugang; Ma Qilin; Yang Shaosong; Liu Guangqiang; Cai Weiping;

  • 作者单位

    Chinese Acad Sci Inst Solid State Phys Key Lab Mat Phys Anhui Key Lab Nanomat &

    Nanotechnol Hefei 230031 Anhui Peoples R China;

    Brookhaven Natl Lab Ctr Funct Nanomat Upton NY 11973 USA;

    Brookhaven Natl Lab Ctr Funct Nanomat Upton NY 11973 USA;

    Chinese Acad Sci Inst Solid State Phys Key Lab Mat Phys Anhui Key Lab Nanomat &

    Nanotechnol Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Inst Solid State Phys Key Lab Mat Phys Anhui Key Lab Nanomat &

    Nanotechnol Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Inst Solid State Phys Key Lab Mat Phys Anhui Key Lab Nanomat &

    Nanotechnol Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Inst Solid State Phys Key Lab Mat Phys Anhui Key Lab Nanomat &

    Nanotechnol Hefei 230031 Anhui Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    corrosion-assisted nanofabrication; Au-Ag alloyed hollow nanocrystals; highly active and chemically-stable SERS substrates;

    机译：腐蚀辅助的纳米制剂;Au-Ag合金中空纳米晶体;高活性和化学稳定的SERS基材;

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