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Close-packed assemblies of discrete tiny silver nanoparticles on triangular gold nanoplates as a high performance SERS probe

机译：三角金纳普板的离散微型银纳米粒子的紧密包装组件作为高性能SERS探头

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摘要

Bimetallic nanocatalysts often display enhanced physical and chemical properties compared to those of their monometallic counterparts. Herein, we introduce a simple method to fabricate an island like array of tiny Ag nanoparticles bounded on triangular Au nanoplates as the surface-enhanced Raman scattering (SERS) substrate. The surface morphology of the synthesized nanoparticles was characterized via field emission scanning electron microscopy (FE-SEM), and atomic force microscopy (AFM). Rhodamine 6G (R6G) is used as a model analyte to evaluate the performance of the tiny Ag nanoparticle bounded triangular Au nanoplates as a SERS-active substrate and validate the SERS effect. The fabricated SERS substrate showed drastically enhanced intensity with a SERS enhancement factor as high as 107, which is enough to detect a single molecule, and excellent reproducibility (less than +/- 5%) of the signal intensity. This is because of the island-like tiny Ag nanoparticle bounded triangular Au nanoplates and their large number of "hot spots". This substrate could also be used for label-free immunoassays, biosensing, and nanoscale optical antennas and light sources.
机译：与它们的单身对应物相比，双金属纳米催化剂经常显示出增强的物理和化学性质。在此，我们介绍了一种简单的方法，用于制造在三角形Au纳米层上界面的微小Ag纳米颗粒阵列的岛状，作为表面增强的拉曼散射（SERs）衬底。通过现场发射扫描电子显微镜（Fe-SEM）和原子力显微镜（AFM）表征合成纳米颗粒的表面形态。罗丹明6G（R6G）用作模型分析物，以评估微小Ag纳米颗粒有界三角形Au纳米板作为SERS-活性基质的性能并验证SERS效果。制造的SERS基板显示出具有高达107的SERS增强因子的稳定增强强度，其足以检测单分子，并且优异的信号强度的再现性（小于+/- 5％）。这是因为岛状微小的Ag纳米粒子有界三角形Au纳米板及其大量的“热点”。该基材还可用于无标记免疫测定，生物传感和纳米级光学天线和光源。

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  • 来源
    《RSC Advances》 |2015年第115期|共6页
  • 作者

    Huang Youju; Kannan Palanisamy; Zhang Lei; Rong Yun; Dai Liwei; Huang Rongqin; Chen Tao;

  • 作者单位

    Chinese Acad Sci Div Polymer &

    Composite Mat Ningbo Inst Mat Technol &

    Engn Ningbo 315201 Zhejiang Peoples R China;

    Nanyang Technol Univ Singapore Ctr Environm Life Sci Engn SCELSE Singapore 639798 Singapore;

    Chinese Acad Sci Div Polymer &

    Composite Mat Ningbo Inst Mat Technol &

    Engn Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Div Polymer &

    Composite Mat Ningbo Inst Mat Technol &

    Engn Ningbo 315201 Zhejiang Peoples R China;

    Chinese Acad Sci Div Polymer &

    Composite Mat Ningbo Inst Mat Technol &

    Engn Ningbo 315201 Zhejiang Peoples R China;

    Fudan Univ Minist Educ Key Lab Smart Drug Delivery Shanghai 201203 Peoples R China;

    Chinese Acad Sci Div Polymer &

    Composite Mat Ningbo Inst Mat Technol &

    Engn Ningbo 315201 Zhejiang Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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