Annealed gold nanoshells with highly-dense hotspots for large-area efficient Raman scattering substrates

Yu, Meidong; Huang, Zhenping; Liu, Zhengqi; Chen, Jian; Liu, Yi; Tang, Li; Liu, Guiqiang

doi:10.1016/j.snb.2018.02.048

Cited by 52 publications

(33 citation statements)

References 38 publications

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“…On the one hand, the extremely enhanced electromagnetic field contributes to the enhancement of Raman signals of target molecules. On the other hand, rich nanogaps avail the adsorption of target molecules and further enhancement of their Raman signals [ 4 , 5 ]. For the single-layer porous Au film, quasi-2D distributed plasmonic hotspots in the xoy plane is observed.…”

Section: Resultsmentioning

confidence: 99%

“…Surface-enhanced Raman scattering (SERS), as a powerful analytical approach, can provide vibration information of target molecules and has been widely investigated and applied in various fields such as bio-sensing and imaging, medical diagnosis, environmental monitoring, and food detection [ 1 – 3 ]. The SERS technique relies prominently on the localized surface plasmonic resonance (LSPR) of metal nanostructures [ 4 , 5 ]. It is well known that the free electrons existing in metal nanostructures would oscillate coherently when they interact with the incident photon under certain conditions and thus produce the LSPR [ 6 – 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, many strategies have been put forward to build 3D SERS platforms [ 16 ]. For example, dielectric nanorods/pillars decorated by Ag nanoparticles have been presented by electroless depositing [ 17 ], physical vapor depositing [ 18 ], reactive ion etching together with annealing and deposition [ 4 ]. These hybrid 3D nanostructures exhibited excellent SERS enhancement due to the formation of high-density plasmonic hotspots with quasi-3D distributed patterns in the metal nanostructures.…”

Section: Introductionmentioning

confidence: 99%

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A Novel SERS Substrate Platform: Spatially Stacking Plasmonic Hotspots Films

Tang

Liu

et al. 2019

Nanoscale Res Lett

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Surface-enhanced Raman scattering (SERS) technique has presented great potential in medical diagnosis, environment monitoring, and food detection due to its high sensitivity, rapid response, and fingerprint effect. Many efforts have been concentrated on all kinds of strategies to produce efficient SERS platforms. Here, we report a simple and controllable method to produce large-area efficient SERS platforms with spatially stacked plasmonic hotspots. The SERS platforms consist of double-layer metal porous films and are easily fabricated by magnetron sputtering and annealing, assisted by the evaporation of hydrofluoric acid. The stacked dual-layer metal porous films show prominent Raman enhancement and ultrasensitive SERS sensing capability for different target molecules. The detection limit is demonstrated down to 10−13 M by detecting rhodamine 6G molecules. These superior Raman properties can be mainly ascribed to the highly dense spatially stacked plasmonic hotspots formed in the dual-layer metal porous films. The simple, controllable, and scalable fabrication strategy and superior Raman performance make these platforms promising candidates for the development of inexpensive, efficient, and mass-produced SERS substrates.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel SERS Substrate Platform: Spatially Stacking Plasmonic Hotspots Films

Tang

Liu

et al. 2019

Nanoscale Res Lett

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“…Plasmonic nanostructures can focus light from far field sources into tiny subwavelength-scale volumes, leading to amplification of a local electric field [ 1 ]. This has many interesting implications, especially when molecules are present in such hot spots, including surface-enhanced spectroscopies [ 2 , 3 , 4 ], super-resolution imaging [ 5 ], ultrasensitive (bio)sensing [ 6 ], strong plasmon-exciton coupling [ 7 , 8 ], etc. For instance, dye molecules, placed in the vicinity of a plasmonic nanostructure, can be coupled to this enhanced electric field, resulting in higher excitation and radiative decay rates, increased quantum yields and a larger number of photons emitted before photobleaching.…”

Section: Introductionmentioning

confidence: 99%

Plasmon-Enhanced Fluorescence of EGFP on Short-Range Ordered Ag Nanohole Arrays

et al. 2020

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Fluorescence of organic molecules can be enhanced by plasmonic nanostructures through coupling to their locally amplified electromagnetic field, resulting in higher brightness and better photostability of fluorophores, which is particularly important for bioimaging applications involving fluorescent proteins as genetically encoded biomarkers. Here, we show that a hybrid bionanosystem comprised of a monolayer of Enhanced Green Fluorescent Protein (EGFP) covalently linked to optically thin Ag films with short-range ordered nanohole arrays can exhibit up to 6-fold increased brightness. The largest enhancement factor is observed for nanohole arrays with a propagating surface plasmon mode, tuned to overlap with both excitation and emission of EGFP. The fluorescence lifetime measurements in combination with FDTD simulations provide in-depth insight into the origin of the fluorescence enhancement, showing that the effect is due to the local amplification of the optical field near the edges of the nanoholes. Our results pave the way to improving the photophysical properties of hybrid bionanosystems based on fluorescent proteins at the interface with easily fabricated and tunable plasmonic nanostructures.

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“…However, annealing is an indispensable process in the fabrication procedures, where both the substrates and the colloidal film have to be heated together. The hot substrates allow long‐range aggregation of the molten gold to form large particles with large separation distance or gap widths between them . This makes it difficult to control the preparation conditions precisely, in particular, the closely packed nanoparticles can be produced only in a small range of the annealing temperatures.…”

Section: Introductionmentioning

confidence: 99%

Direct Laser Annealing of Surface‐Enhanced Raman Scattering Substrates

Cao

2019

Adv Eng Mater

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A laser‐annealing technique for the fabrication of surface‐enhanced Raman scattering (SERS) substrates consisting of closely packed gold nanoparticles (AuNPs) with high densities and small separation distances is reported. Laser annealing enables strongly localized interaction between the laser spot and the colloidal AuNPs within the irradiation area. Multiple stages of the alternative spin‐coating of colloidal AuNPs and laser‐annealing processes enable filling of the gaps between the AuNPs by newly produced ones in the subsequent stages. Thus, both the fill factor and the distribution density of the AuNPs are increased largely with increasing the number of fabrication stages, which favors the improvement of the SERS performance. In contrast, the conventional furnace or hot‐plate annealing heats the substrate and the colloidal film simultaneously, and the melted AuNPs tend to aggregate to form larger ones with large separation distance. Thus, compared with the SERS effective by furnace‐annealed substrates, laser‐annealed substrates supply a further enhancement factor larger than 3.7. Thus, laser annealing is proved as a more effective approach for the fabrication of SERS substrates through annealing colloidal AuNPs.

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Annealed gold nanoshells with highly-dense hotspots for large-area efficient Raman scattering substrates

Cited by 52 publications

References 38 publications

A Novel SERS Substrate Platform: Spatially Stacking Plasmonic Hotspots Films

A Novel SERS Substrate Platform: Spatially Stacking Plasmonic Hotspots Films

Plasmon-Enhanced Fluorescence of EGFP on Short-Range Ordered Ag Nanohole Arrays

Direct Laser Annealing of Surface‐Enhanced Raman Scattering Substrates

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