中国物理B ›› 2018, Vol. 27 ›› Issue (7): 77406-077406.doi: 10.1088/1674-1056/27/7/077406

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Highly sensitive and stable SERS probes of alternately deposited Ag and Au layers on 3D SiO2 nanogrids for detection of trace mercury ions

Yi Tian(田毅), Han-Fu Wang(王汉夫), Lan-Qin Yan(闫兰琴), Xian-Feng Zhang(张先锋), Attia Falak, Pei-Pei Chen(陈佩佩), Feng-Liang Dong(董凤良), Lian-Feng Sun(孙连峰), Wei-Guo Chu(禇卫国)   

  1. 1 CAS Key Laboratory for Nanosystems and Hierachical Fabrication, Nanofabrication Laboratory, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2018-05-11 出版日期:2018-07-05 发布日期:2018-07-05
  • 通讯作者: Pei-Pei Chen, Feng-Liang Dong, Lian-Feng Sun, Wei-Guo Chu E-mail:chenpp@nanoctr.cn;dongfl@nanoctr.cn;slf@nanoctr.cn;wgchu@nanoctr.cn
  • 基金资助:

    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0207104), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA09040101), the National Natural Science Foundation of China (Grant No. Y6061111JJ), the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2015030), and the Key Technology Talent Program of Chinese Academy of Sciences (Grant Nos. Y8482911ZX and Y7602921ZX).

Highly sensitive and stable SERS probes of alternately deposited Ag and Au layers on 3D SiO2 nanogrids for detection of trace mercury ions

Yi Tian(田毅)1,2, Han-Fu Wang(王汉夫)1, Lan-Qin Yan(闫兰琴)1, Xian-Feng Zhang(张先锋)1, Attia Falak1,2, Pei-Pei Chen(陈佩佩)1, Feng-Liang Dong(董凤良)1, Lian-Feng Sun(孙连峰)1,2, Wei-Guo Chu(禇卫国)1,2   

  1. 1 CAS Key Laboratory for Nanosystems and Hierachical Fabrication, Nanofabrication Laboratory, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-05-11 Online:2018-07-05 Published:2018-07-05
  • Contact: Pei-Pei Chen, Feng-Liang Dong, Lian-Feng Sun, Wei-Guo Chu E-mail:chenpp@nanoctr.cn;dongfl@nanoctr.cn;slf@nanoctr.cn;wgchu@nanoctr.cn
  • Supported by:

    Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0207104), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA09040101), the National Natural Science Foundation of China (Grant No. Y6061111JJ), the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2015030), and the Key Technology Talent Program of Chinese Academy of Sciences (Grant Nos. Y8482911ZX and Y7602921ZX).

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摘要：

The hazard of Hg ion pollution triggers the motivation to explore a fast, sensitive, and reliable detection method. Here, we design and fabricate novel 36-nm-thick Ag-Au composite layers alternately deposited on three-dimensional (3D) periodic SiO2 nanogrids as surface-enhanced Raman scattering (SERS) probes. The SERS effects of the probes depend mainly on the positions and intensities of their localized surface plasmon resonance (LSPR) peaks, which is confirmed by the absorption spectra from finite-difference time-domain (FDTD) calculations. By optimizing the structure and material to maximize the intrinsic electric field enhancement based on the design method of 3D periodic SERS probes proposed, high performance of the Ag-Au/SiO2 nanogrid probes is achieved with the stability further enhanced by annealing. The optimized probes show the outstanding stability with only 4.0% SERS intensity change during 10-day storage, the excellent detection uniformity of 5.78% (RSD), the detection limit of 5.0×10-12 M (1 ppt), and superior selectivity for Hg ions. The present study renders it possible to realize the rapid and reliable detection of trace heavy metal ions by developing high-performance 3D periodic structure SERS probes by designing novel 3D structure and optimizing plasmonic material.

关键词: surface-enhanced Raman scattering, Ag-Au composite layer, nanostructure design, trace Hg ions detection

Abstract:

The hazard of Hg ion pollution triggers the motivation to explore a fast, sensitive, and reliable detection method. Here, we design and fabricate novel 36-nm-thick Ag-Au composite layers alternately deposited on three-dimensional (3D) periodic SiO2 nanogrids as surface-enhanced Raman scattering (SERS) probes. The SERS effects of the probes depend mainly on the positions and intensities of their localized surface plasmon resonance (LSPR) peaks, which is confirmed by the absorption spectra from finite-difference time-domain (FDTD) calculations. By optimizing the structure and material to maximize the intrinsic electric field enhancement based on the design method of 3D periodic SERS probes proposed, high performance of the Ag-Au/SiO2 nanogrid probes is achieved with the stability further enhanced by annealing. The optimized probes show the outstanding stability with only 4.0% SERS intensity change during 10-day storage, the excellent detection uniformity of 5.78% (RSD), the detection limit of 5.0×10-12 M (1 ppt), and superior selectivity for Hg ions. The present study renders it possible to realize the rapid and reliable detection of trace heavy metal ions by developing high-performance 3D periodic structure SERS probes by designing novel 3D structure and optimizing plasmonic material.

Key words: surface-enhanced Raman scattering, Ag-Au composite layer, nanostructure design, trace Hg ions detection

中图分类号:  (Raman and optical spectroscopy)

  • 74.25.nd
73.90.+f (Other topics in electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures) 78.30.-j (Infrared and Raman spectra) 78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)