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 15 publications

(4 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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“…Surface-enhanced Raman scattering (SERS) is one of the most promising analytical techniques to have emerged over the years as laser technology, nanophotonics, and plasmonics have advanced [1]. It is a method for enhancing the electromagnetic field on the surface of noble-metal nanostructures or nanogaps by combining Raman spectroscopy with the localised surface plasmon resonance effect [2][3][4]. In general, it addresses the limitation of the weak Raman scattering of molecules, effectively amplifying the subtle Raman signals [4,5].…”

Section: Introductionmentioning

confidence: 99%

Heat-Induced Fragmentation and Adhesive Behaviour of Gold Nanowires for Surface-Enhanced Raman Scattering Substrates

Trausa,

Tipaldi,

Ignatane

et al. 2024

ChemEngineering

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This study explores a novel approach to surface-enhanced Raman scattering (SERS) substrate fabrication through the heat-induced fragmentation of gold nanowires (Au NWs) and its impact on gold nanoparticle adhesion/static friction using atomic force microscopy manipulations. Controlled heating experiments and scanning electron microscopy measurements reveal significant structural transformations, with NWs transitioning into nanospheres or nanorods in a patterned fashion at elevated temperatures. These morphological changes lead to enhanced Raman signals, particularly demonstrated in the case of Rhodamine B molecules. The results underscore the critical role of NW shape modifications in augmenting the SERS effect, shedding light on a cost-effective and reliable method for producing SERS substrates.

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Au/Ag SERS active substrate for broader wavelength excitation

Cited by 15 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

Heat-Induced Fragmentation and Adhesive Behaviour of Gold Nanowires for Surface-Enhanced Raman Scattering Substrates

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Au/Ag SERS active substrate for broader wavelength excitation

Cited by 15 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

Heat-Induced Fragmentation and Adhesive Behaviour of Gold Nanowires for Surface-Enhanced Raman Scattering Substrates

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