Composite Structure of Ag Colloidal Particles and Au Sinusoidal Nanograting with Large-Scale Ultra-High Field Enhancement for SERS Detection

Chen, Zhaoyi; Chen, Zhibin; Shen, Jinxing; Li, Huanliang

doi:10.3390/photonics8100415

Cited by 4 publications

(3 citation statements)

References 36 publications

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“…The detection of TNT and RDX up to 10 –11 M concentration has been demonstrated by combining one-dimensional (1D) silver grating and gold nanosphere colloids . TNT and RDX detection with a LOD of 10 –10 M has been shown by combining gold sinusoidal nanograting and silver colloidal nanoparticles as the SERS substrate . Using gold nanoparticles on the TiO 2 nanorod array as the SERS substrate detected 10 –7 M TNT .…”

Section: Resultsmentioning

confidence: 99%

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Nanogap-Rich Surface-Enhanced Raman Spectroscopy-Active Substrate Based on Double-Step Deposition and Annealing of the Au Film over the Back Side of Polished Si

Awasthi

Malik

Goel

et al. 2023

ACS Appl. Mater. Interfaces

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Surface-enhanced Raman spectroscopy (SERS) is a highly sensitive and rapid detection technique that is used for detection of various analytes in trace quantities. We present a sensitive, large-area, and nanogap-rich SERS-active substrate by altering a thin gold (Au) film on the unpolished side of a single-side polished silicon wafer by repeated thermal deposition and annealing in an argon environment. The repeated thermal deposition and annealing process was compared on both sides of a one-side-polished silicon wafer; however, the rear side (etched/ unpolished side) demonstrated a more enhanced Raman signal owing to the larger effective area. The proposed substrate can be fabricated easily, having a high density of hotspots distributed uniformly all over the substrate. This ensures easy, rapid, and sensitive detection of analytes with a high degree of reproducibility, repeatability, and acceptable uniformity. The optimized substrate shows a high degree of stability with time when exposed to the ambient environment for a longer duration of 148 days. The reported substrate can detect up to 10 −11 M concentrations of 2,4,6-trinitrotoluene (TNT) and 2,4-dinitrotoluene (DNT), with limits of detection (LODs) of 1.22 and 1.26 ng/L, respectively. This work not only presents the efficient and sensitive SERS-active substrate but also shows the advantages of using the rear side of a one-side-polished silicon substrate as a SERS-active chip.

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Section: Resultsmentioning

confidence: 99%

“…45 TNT and RDX detection with a LOD of 10 −10 M has been shown by combining gold sinusoidal nanograting and silver colloidal nanoparticles as the SERS substrate. 46 Using gold nanoparticles on the TiO 2 nanorod array as the SERS substrate detected 10 −7 M TNT. 47 Selfassembled gold triangular nanoprisms were used to detect up to 10 −10 M TNT.…”

Section: Dntmentioning

confidence: 99%

Nanogap-Rich Surface-Enhanced Raman Spectroscopy-Active Substrate Based on Double-Step Deposition and Annealing of the Au Film over the Back Side of Polished Si

Awasthi

Malik

Goel

et al. 2023

ACS Appl. Mater. Interfaces

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“…The nature of coupled plasmonic nanoparticles allows for the localized enhancement of plasmon strength, allowing for nanoprecise chemical transformations or material grafting. − In particular, chemical transformations can occur in spatially restricted areas with a more pronounced concentration of the plasmon EF. This method of spatially selective modification clears the way for the creation of a whole series of improved plasmonic substrates with broader functionality in the sensorics field and chemical technology. − In this work, we demonstrated the ability to utilize SPP–LSP plasmonic coupling for nanoprecise chemical transformation for the first time. To model the chemical transformation, we used the well-known dimerization of amino groups and the related azo-bridge formation reaction, which lead to the spatially selective immobilization of plasmon-active Au nanoparticles (AuNPs) on the surface of the Au grating.…”

Section: Introductionmentioning

confidence: 91%

Immobilization of Gold Nanoparticles in Localized Surface Plasmon Polariton-Coupled Hot Spots via Photolytic Dimerization of Aromatic Amine Groups for SERS Detection in a Microfluidic Regime

Burtsev

Милютина

Ulbrich

et al. 2022

ACS Appl. Nano Mater.

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Plasmon-assisted chemistry is an effective tool for triggering various chemical transformations that can be performed with high spatial precision. Plasmon-triggering efficiency is ensured by a high concentration of light energy near the plasmonic surface and the resulting enhancement of the local electric field (EF). The coupling of different plasmonic nanostructures by multimodal plasmonic hot spots can significantly enhance the EF, increasing plasmon-triggering efficiency. In this work, we demonstrate that the coupling between the traveled surface plasmon polariton (SPP) wave and the localized surface plasmon (LSP) resonance can be used to effectively realize plasmon-induced organic reactions, even in hot spots between SPP-and LSP-supported Au nanostructures. The periodically modulated surface of the gold grating was used as an SPP-active plasmonic support, with spherical Au nanoparticles (AuNPs) ensuring LSP excitation. To model the chemical transformation, we utilized the dimerization of amino groups (previously grafted to Au nanostructures) with azo bridges between the AuNPs and Au grating. The reaction was performed in a microfluidic regime and resulted in AuNP immobilization on the grating surface. Experiments and theoretical studies indicated that the azo-bridge formation and AuNP immobilization occurred only under illumination with the SPP wavelength and proceeded more effectively on the grating walls (particularly the inflection points), where the EF enhancement is greatest due to LSP−SPP coupling. Created structures were subsequently demonstrated as a promising substrate for the SERS-based detection in the microfluidic regime.

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Tunable High-Q Factor Substrate for Selectively Enhanced Raman Scattering

Chen

et al. 2022

Photonics

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Most Surface-enhanced Raman scattering (SERS) substrates enhance all the Raman signals in a relative broad spectral range. The substrates enhance both the interested and background signals together. To improve the identification of target molecules from numerous background ones, substrates with multi high-quality (Q) factor resonance wavelengths can be designed to achieve the selective enhancement of specific Raman transitions. When the resonance frequencies are modulated to match the excitation and Raman scattering frequencies, the detection of the target molecule can be more effective. In this paper, we design a tunable high-Q SERS substrate with periodic silver bowtie nanoholes on silica spacer and silver film. The substrate possessed three high-Q and high electric field resonance modes, which resulted from the interaction of the localized surface plasmon resonance (LSPR) of the bowtie nanoholes, the surface plasmon polariton (SPP) of the period bowtie nanoholes and the Fabry–Perot (FP) resonance between the bowtie and silver film bottom. The interaction between these resonance modes resulted in not only a higher quality (Q) factor, but also a higher electric field, which can be employed to realize a potential substrate in high-sensitivity and selective-detection fields.

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Composite Structure of Ag Colloidal Particles and Au Sinusoidal Nanograting with Large-Scale Ultra-High Field Enhancement for SERS Detection

Cited by 4 publications

References 36 publications

Nanogap-Rich Surface-Enhanced Raman Spectroscopy-Active Substrate Based on Double-Step Deposition and Annealing of the Au Film over the Back Side of Polished Si

Nanogap-Rich Surface-Enhanced Raman Spectroscopy-Active Substrate Based on Double-Step Deposition and Annealing of the Au Film over the Back Side of Polished Si

Immobilization of Gold Nanoparticles in Localized Surface Plasmon Polariton-Coupled Hot Spots via Photolytic Dimerization of Aromatic Amine Groups for SERS Detection in a Microfluidic Regime

Tunable High-Q Factor Substrate for Selectively Enhanced Raman Scattering

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