期刊
OPTICS EXPRESS
卷 26, 期 17, 页码 21546-21557出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.26.021546
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资金
- National Natural Science Foundation of China [11504208, 11747072, 11774208, 11474187, 11674199, 11604040]
- Shandong Province Natural Science Foundation [ZR2017BA004, ZR2013HQ064, ZR2013AQ012, ZR2016AM19]
- Project of Shandong Province Higher Educational Science and Technology Program [J18KZ011]
- China Postdoctoral Science Foundation [2016M602716]
It is very vital to construct the dense hot spots for the strong surface-enhanced Raman scattering (SERS) signals. We take full advantage of the MoS2 edge-active sites induced from annealing the Ag film on the surface of the MoS2. Furthermore, the composite structure of Au-Ag bi-metal nanoparticles (NPs)/MoS2 hybrid with pyramid structure is obtained by the in situ grown AuNPs around AgNPs, which serves the optimal SERS performance (enhancement factor is similar to 9.67 x 10(9)) in experiment. Due to the introduction of AuNP5 with the simple method, the denser hot spots contribute greatly to the stronger local electric field, which is also confirmed by the finite-different time-domain (FDTD) simulation. Therefore, the ultralow limit of detection (the LOD of 10(-13) and 10(-12) M respectively for the resonant R6G and non-resonant CV), quantitative detection and excellent reproducibility are achieved by the proposed SERS substrate. For practical application, the melamine molecule is detected with the LOD of 10(-10) M using the proposed SERS substrate that has the potential to be a food security sensor. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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