Journal
OPTICS EXPRESS
Volume 25, Issue 17, Pages 20631-20641Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.020631
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Funding
- National Natural Science Foundation of China (NSFC) [11474187, 11674199, 11604040]
- Shandong Province Natural Science Foundation [ZR2014FQ032, ZR2016AM19]
- China Postdoctoral Science Foundation [2016M600550, 2016M602716]
- Project of Shandong Province Higher Educational Science and Technology Program [J15LJ01]
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The physical phenomenon, surface-enhanced Raman scattering (SERS), is mainly based on the local electromagnetic fields enhancement located at the nano-gaps between metal nanostructures attributed to localized surface plasmon resonance. Therefore, nano-gaps are very important for obtaining high-density hot spots and optimal and uniform SERS signals. However, it remains a challenge to form the three-dimensional ultra-narrow nanogaps. Here, a gyrus-inspired Gyrus-SERS substrate was fabricated with the nanostructure of Ag gyrus/graphene/Au film using an extremely simple method. The lateral and vertical hot spots respectively were obtained from the dense nano-gaps (similar to 3 nm) between gyrus and the coupling of Ag gyrus and Au film in bilayer graphene nano-gaps (0.68 nm), which were demonstrated in experiment and theory. The proposed Gyrus-SERS platform performs an excellent SERS activity (EF similar to 5 x 10(9)), high sensitivity (the minimum detected concentration of R6G and CV respectively is 10(-13) and 10(-12) M), and outstanding reproducibility (RSD similar to 7.11%). For practical application, the in situ detection of Malachite green (MG) residue on prawn skin was executed using the prepared flexible Gyrus-SERS substrate, which shows the wide potential in food safety field. (C) 2017 Optical Society of America
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