Journal
NANOMATERIALS
Volume 12, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/nano12030401
Keywords
SERS; metal-dielectric-metal; Au nanoparticles; hot spots; FDTD simulation
Categories
Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2019R1A2C1007883, 2021R1F1A1060364]
- Regional Innovation Strategy (RIS) through the National Research Foundation of Korea (NRF) - Ministry of Education (MOE) [2021RIS-004]
- National Research Foundation of Korea [2021R1F1A1060364] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, a hierarchically assembled 3D plasmonic metal-dielectric-metal hybrid nano-architecture was designed and prepared for high-performance surface-enhanced Raman scattering (SERS) sensing. The fabricated PMDM hybrid nanostructures exhibited strong SERS signals with highly enhanced electromagnetic hot spots, achieving outstanding SERS performance.
In this work, we designed and prepared a hierarchically assembled 3D plasmonic metal-dielectric-metal (PMDM) hybrid nano-architecture for high-performance surface-enhanced Raman scattering (SERS) sensing. The fabrication of the PMDM hybrid nanostructure was achieved by the thermal evaporation of Au film followed by thermal dewetting and the atomic layer deposition (ALD) of the Al2O3 dielectric layer, which is crucial for creating numerous nanogaps between the core Au and the out-layered Au nanoparticles (NPs). The PMDM hybrid nanostructures exhibited strong SERS signals originating from highly enhanced electromagnetic (EM) hot spots at the 3 nm Al2O3 layer serving as the nanogap spacer, as confirmed by the finite-difference time-domain (FDTD) simulation. The PMDM SERS substrate achieved an outstanding SERS performance, including a high sensitivity (enhancement factor, EF of 1.3 x 10(8) and low detection limit 10(-11) M) and excellent reproducibility (relative standard deviation (RSD) < 7.5%) for rhodamine 6G (R6G). This study opens a promising route for constructing multilayered plasmonic structures with abundant EM hotspots for the highly sensitive, rapid, and reproducible detection of biomolecules.
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