Au/Ag SERS active substrate for broader wavelength excitation

Augustine, Sebin; Saini, Mahesh; K.P., Sooraj; Parida, Basanta Kumar; Hans, Sukriti; Pachchigar, Vivek; Satpati, Biswarup; Ranjan, Mukesh

doi:10.1016/j.optmat.2022.113319

Cited by 10 publications

(3 citation statements)

References 43 publications

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“…Moreover, Au NPs are extremely biocompatible with most of the with functional organic molecules. Novel photonic devices, photothermal contrast imaging, surfaced enhanced Raman spectroscopy (SERS), cancer treatment, light-triggered drug release are other pivotal applications employing absorption of light [39][40][41][42]. Cellular and biological imaging and bio-affinity sensors are other useful implementations.…”

Section: Discussionmentioning

confidence: 99%

Nonlinear laser absorption on metal surface embedded with nanoparticles in the presence of external magnetic field

Simon

Chauhan

2023

Phys. Scr.

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A nonlinear analytical model is developed for the absorption of a p-polarized laser that is obliquely incident on a metal surface embedded with metallic nanoparticles under the influence of an external magnetic field. The model suggests that the absorption coefficient is proportional to the angle of incidence and cube of nanoparticle-radius, but inversely proportional to the square of interparticle separation. Obtained results show that the laser absorption by the nanoparticles is substantially amplified due to plasmon resonance in the presence of an external magnetic field. The absorption coefficient has a sharp peak at surface plasma resonance ω=ωp/3, where ωp is the plasma frequency and it shows explicit dependence on the amplitude transmission coefficient TA of the incident wave. Absorption coefficient is obtained for gold nanoparticles for different incident angles, radii and interparticle separations and this study is of direct relevance in high performance optoelectronic devices, solar cells and nanomedicines.

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Section: Discussionmentioning

confidence: 99%

Nonlinear laser absorption on metal surface embedded with nanoparticles in the presence of external magnetic field

Simon

Chauhan

2023

Phys. Scr.

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“…48 Upon decoration with Au NPs on the MoS 2 NFs, a new absorption peak emerges around 532 nm corresponding to the Au local surface plasma resonance (LSPR) band formation (λ EM ≈ λ laser ), indicating the successful generation of Au NPs and achievement of enhanced electromagnetic effects. 49,50 Thus, we propose a coupled resonance strategy for semiconductormetal SERS substrates: λ mol ≈ λ EM ≈ λ laser . Importantly, both molecular resonance and plasma resonance significantly contribute to the outstanding SERS performance.…”

Section: T H Imentioning

confidence: 99%

Resonance-Assisted Surface-Enhanced Raman Spectroscopy Amplification on Hierarchical Rose-Shaped MoS₂/Au Nanocomposites

Yu,

Sun,

et al. 2023

Langmuir

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Surface-enhanced Raman spectroscopy (SERS) has emerged as a highly sensitive trace detection technique in recent decades, yet its exceptional performance remains elusive in semiconductor materials due to the intricate and ambiguous nature of the SERS mechanism. Herein, we have synthesized MoS2 nanoflowers (NFs) decorated with Au nanoparticles (NPs) by hydrothermal and redox methods to explore the size-dependence SERS effect. This strategy enhances the interactions between the substrate and molecules, resulting in exceptional uniformity and reproducibility. Compared to the unadorned Au nanoparticles (NPs), the decoration of Au NPs induces an n-type effect on MoS2, resulting in a significant enhancement of the SERS effect. This augmentation empowers MoS2 to achieve a low limit of detection concentration of 2.1 × 10–9 M for crystal violet (CV) molecules and the enhancement factor (EF) is about 8.52 × 106. The time-stability for a duration of 20 days was carried out, revealing that the Raman intensity of CV on the MoS2/Au-6 substrate only exhibited a reduction of 24.36% after undergoing aging for 20 days. The proposed mechanism for SERS primarily stems from the synergistic interplay among the resonance of CV molecules, local surface plasma resonance (LSPR) of Au NPs, and the dual-step charge transfer enhancement. This research offers comprehensive insights into SERS enhancement and provides guidance for the molecular design of highly sensitive SERS systems.

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“…Therefore, sensitive detection of rhodamine is desperately needed. Surface-enhanced Raman scattering (SERS) through noble metal nanoparticles is gaining much scientific interest due to its potential applications in chemical detection, pollutant detection, biomedical engineering, biosensors, and photonics [4][5][6][7][8]. Metal nanostructures differ from their bulk counterparts in optical, electrical, and chemical properties because of their nano-dimensional size.…”

Section: Introductionmentioning

confidence: 99%

A correlation between fractal growth, water contact angle, and SERS intensity of R6G on ion beam nanostructured ultra-thin gold (Au) films

Jasrotia

Priya²,

Kumar³

et al. 2023

Front. Phys.

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Introduction: This study focuses on the detection of rhodamine-6G using surface-enhanced Raman scattering (SERS) on gold nanostructures (AuNS) of different sizes. Ion beam irradiation has been carried out to tune the size of AuNS and investigate the underlying mechanisms of sputtering and diffusion that govern their growth. Additionally, the study established a correlation between fractal growth parameters, water contact angle, and SERS detection of R6G. The results of this study offer new insights into the mechanisms of SERS detection on roughened metallic surfaces.Methods: Thermal evaporation was used to deposit an Au thin film on a glass substrate. Subsequent 10 keV Ar+ irradiation was done on Au thin film for fluences ranging from 3×1014 to 3×1016 ions/cm2 to tune the size of AuNS. Rutherford backscattering spectroscopy (RBS) was used to confirm that the decrease in Au concentration under ion beam sputtering was responsible for the tuning in size and structure of AuNS. Fractal dimension (Df) and interface width (w) were used as statistical parameters to control the wettable characteristics of the AuNS surfaces.Results and discussion: The researchers found that the growth of AuNS was governed by ion beam induced sputtering and diffusion mechanisms. They established a correlation between fractal growth parameters, water contact angle, and SERS detection of R6G. They found that a higher surface coverage area of Au NPs with lower fractal dimensions and water contact angles favoured the SERS detection of R6G. This study provides new insights into the mechanisms of SERS detection on roughened metallic surfaces. It is found that the growth of AuNS was governed by ion beam-induced sputtering and diffusion mechanisms, and established a correlation between fractal growth parameters, water contact angle, and SERS detection of R6G. The findings of this study may have applications in the development of more sensitive and efficient SERS-based chemical sensors.

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Au/Ag SERS active substrate for broader wavelength excitation

Cited by 10 publications

References 43 publications

Nonlinear laser absorption on metal surface embedded with nanoparticles in the presence of external magnetic field

Nonlinear laser absorption on metal surface embedded with nanoparticles in the presence of external magnetic field

Resonance-Assisted Surface-Enhanced Raman Spectroscopy Amplification on Hierarchical Rose-Shaped MoS₂/Au Nanocomposites

A correlation between fractal growth, water contact angle, and SERS intensity of R6G on ion beam nanostructured ultra-thin gold (Au) films

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Au/Ag SERS active substrate for broader wavelength excitation

Cited by 10 publications

References 43 publications

Nonlinear laser absorption on metal surface embedded with nanoparticles in the presence of external magnetic field

Nonlinear laser absorption on metal surface embedded with nanoparticles in the presence of external magnetic field

Resonance-Assisted Surface-Enhanced Raman Spectroscopy Amplification on Hierarchical Rose-Shaped MoS2/Au Nanocomposites

A correlation between fractal growth, water contact angle, and SERS intensity of R6G on ion beam nanostructured ultra-thin gold (Au) films

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Resonance-Assisted Surface-Enhanced Raman Spectroscopy Amplification on Hierarchical Rose-Shaped MoS₂/Au Nanocomposites