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18 December 2019
Spatial Raman mapping investigation of SERS performance related to localized surface plasmons
Feng Luo1(
)
)
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Liu Y, Luo F.
Spatial Raman mapping investigation of SERS performance related to localized surface plasmons.
Nano Research,
2020, 13(1): 138-144.
https://doi.org/10.1007/s12274-019-2586-2
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In this research, it reported a novel three-dimensional (3D) metallic hybrid system by introducing single-layer graphene (SLG) between silver nanoparticles (NPs) and silver nano-discs (NDs) arrays (Ag NPs/SLG/Ag NDs). By combining the plasmonic metallic nanostructures and the unique physical/chemical properties of graphene, Ag NPs/SLG/Ag NDs hybrid substrate was fabricated, and it exhibited extremely high surface-enhanced Raman scattering (SERS) performance. By tuning the diameter of Ag NDs, the SERS performance of Ag NPs/SLG/Ag NDs hybrid substrate has been systematically studied. The detection limit for rhodamine 6g (R6G) could reach the concentrations as low as 1 × 10-12 mol/L, and the average enhancement factor (EF) of the Ag NPs/SLG/Ag NDs substrate could reach 5.65 × 108. These advantages indicated that the Ag NPs/SLG/Ag NDs hybrid substrate could be regarded as a candidate for organic molecules detection under extremely low concentration. Besides, spatial Raman mapping of Ag NPs/SLG/Ag NDs with 2.5 μm diameter NDs showed the larger SERE signal existed around the rim of Ag NDs which was related to the localized surface plasmons. This phenomenon was contributed by a larger electromagnetic field which was tuned by Ag NPs and the edge of Ag NDs. This mechanism also has been confirmed by the electromagnetic simulation result.
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Spatial Raman mapping investigation of SERS performance related to localized surface plasmons
Feng Luo1(
)
)
Abstract
In this research, it reported a novel three-dimensional (3D) metallic hybrid system by introducing single-layer graphene (SLG) between silver nanoparticles (NPs) and silver nano-discs (NDs) arrays (Ag NPs/SLG/Ag NDs). By combining the plasmonic metallic nanostructures and the unique physical/chemical properties of graphene, Ag NPs/SLG/Ag NDs hybrid substrate was fabricated, and it exhibited extremely high surface-enhanced Raman scattering (SERS) performance. By tuning the diameter of Ag NDs, the SERS performance of Ag NPs/SLG/Ag NDs hybrid substrate has been systematically studied. The detection limit for rhodamine 6g (R6G) could reach the concentrations as low as 1 × 10-12 mol/L, and the average enhancement factor (EF) of the Ag NPs/SLG/Ag NDs substrate could reach 5.65 × 108. These advantages indicated that the Ag NPs/SLG/Ag NDs hybrid substrate could be regarded as a candidate for organic molecules detection under extremely low concentration. Besides, spatial Raman mapping of Ag NPs/SLG/Ag NDs with 2.5 μm diameter NDs showed the larger SERE signal existed around the rim of Ag NDs which was related to the localized surface plasmons. This phenomenon was contributed by a larger electromagnetic field which was tuned by Ag NPs and the edge of Ag NDs. This mechanism also has been confirmed by the electromagnetic simulation result.
Keywords:
graphene, high performance, surface-enhanced Raman scattering (SERS), plasmon, mapping
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Publication history
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Acknowledgements
Publication history
Received: 30 October 2019
Revised: 25 November 2019
Accepted: 28 November 2019
Published:
18 December 2019
Issue date: January 2020
Copyright
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019
Acknowledgements
This work has been supported by China Scholarship Council, the National Natural Science Foundation of China (Nos. 201606180013 and 51520105003) and MINISTERIO DE ECONOMÍA, INDUSTRIA Y COMPETITIVIDAD (No. MAT2017-89868-P).
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