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

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

作者机构：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 University of Chinese Academy of Sciences Beijing 100049 China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2018年第27卷第7期

页      面：497-506页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070302[理学-分析化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0704[理学-天文学] 

基　　金：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) the Key Technology Talent Program of Chinese Academy of Sciences(Grant Nos.Y8482911ZX and Y7602921ZX) 

主　　题：surface-enhanced Raman scattering Ag-Au composite layer nanostructure design trace Hg ions detection 

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.