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

doi:10.1088/1674-1056/27/7/077406

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.

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

Received: 11 May 2018
Accepted manuscript online:

PACS:	74.25.nd	(Raman and optical spectroscopy)
	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)

Fund:

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).

Corresponding Authors: 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

Cite this article:

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) Highly sensitive and stable SERS probes of alternately deposited Ag and Au layers on 3D SiO₂ nanogrids for detection of trace mercury ions 2018 Chin. Phys. B 27 077406

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

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