Facile fabrication of nanoporous gold films for surface plasmon resonance (SPR) sensing and SPR-based SERS

Chen, Chen; Liu, Ziwei; Cai, Chuanbing; Qi, Zhi-mei

doi:10.1039/d1tc01046h

Cited by 22 publications

(17 citation statements)

References 30 publications

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“…An attractive alternative to nanoslits are therefore SERS hotspots formed by nanopores that naturally arise during the formation or postprocessing of metallic films. Such porous thin metal films have recently received attention in various fields such as plasmonics, photovoltaics, catalysis, and electrochemistry. , SERS from supported porous thin films − and dealloyed gold membranes have been studied, investigating their Raman enhancement as a function of gap width. , However, to the best of our knowledge, freestanding porous SERS structures with pores that deliver appreciable field enhancement have not been studied thus far. − …”

Section: Introductionmentioning

confidence: 99%

Freestanding and Permeable Nanoporous Gold Membranes for Surface-Enhanced Raman Scattering

Wyss

Parzefall

Gruber

et al. 2022

ACS Appl. Mater. Interfaces

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Surface-enhanced Raman spectroscopy (SERS) demands reliable, high-enhancement substrates in order to be used in different fields of application. Here we introduce freestanding porous gold membranes (PAuM) as easy-to-produce, scalable, mechanically stable, and effective SERS substrates. We fabricate large-scale sub-30 nm thick PAuM that form freestanding membranes with varying morphologies depending on the nominal gold thickness. These PAuM are mechanically stable for pressures up to more than 3 bar and exhibit surface-enhanced Raman scattering with local enhancement factors from 104 to 105, which we demonstrate by wavelength-dependent and spatially resolved Raman measurements using graphene as a local Raman probe. Numerical simulations reveal that the enhancement arises from individual, nanoscale pores in the membrane acting as optical slot antennas. Our PAuM are mechanically stable, provide robust SERS enhancement for excitation power densities up to 106 W cm–2, and may find use as a building block in SERS-based sensing applications.

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Section: Introductionmentioning

confidence: 99%

Freestanding and Permeable Nanoporous Gold Membranes for Surface-Enhanced Raman Scattering

Wyss

Parzefall

Gruber

et al. 2022

ACS Appl. Mater. Interfaces

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“…If the the film is incomplete and discontinuous, it is conducive to the propagation of LSPR. 30 The plasmonic properties of cosputtered nanoparticles film were analyzed and confirmed using UV−vis spectroscopy 31 Figure 3(c). For the 30 and 60 s cosputtered films, the spectral characteristics show an obvious peak around 450 nm due to LSPR.…”

Section: ■ Experimental Detailsmentioning

confidence: 99%

Flexible SERS Substrate with a Ag–SiO₂ Cosputtered Film for the Rapid and Convenient Detection of Thiram

et al. 2022

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It is very important to build uniform large-area dense hotspots to improve the surface-enhanced Raman scattering (SERS) detection limit. In our research, we designed and prepared a new flexibile SERS substrate with ultradense hot spots that has the advantages of high sensitivity, good repeatability, easy fabrication, and low cost. Due to the special dense hot spot structure, the substrate reaches a SERS enhancement factor of 2.1 × 1011. Because of the excellent physical stability of polydimethylsiloxane, the substrate can be bent at will, and the SERS performance will not change with bending. This is very important to extract effective detection objects on complex surfaces. The substrate has good light transmittance and softness and can be directly attached to the detected agricultural products to realize real-time and rapid SERS monitoring. This structure exhibits extraordinary performance for thiram detection in the ultralow concentration range of 10–13 M.

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“…Another “hot spot” effect is based on planar substrate materials, which exist between nanoparticles and planar substrates, and/or between two planar substrates (Fu et al., 2022). Solid substrate materials constructed by etching (Jin et al., 2021), sputtering (Chen et al., 2021; Chung et al., 2021), self‐assembly (Li, Lin, et al., 2022), and other methods also play an important role in SERS analysis.…”

Section: Introductionmentioning

confidence: 99%

Advances in surface‐enhanced Raman spectroscopy technology for detection of foodborne pathogens

Zhu

Ali

Jiao

et al. 2023

Comp Rev Food Sci Food Safe

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Rapid control and prevention of diseases caused by foodborne pathogens is one of the existing food safety regulatory issues faced by various countries and has received wide attention from all sectors of society. The development of rapid and reliable detection methods for foodborne pathogens remains a hot research area for food safety and public health because of the limitations of complex steps, time-consuming, low sensitivity, or poor selectivity of commonly used methods.Surface-enhanced Raman spectroscopy (SERS), as a novel spectroscopic technique, has the advantages of high sensitivity, selectivity, rapid and nondestructive detection and has exhibited broad application prospects in the determination of pathogenic bacteria. In this study, the enhancement mechanisms of SERS are briefly introduced, then the characteristics and properties of liquid-phase, rigid solid-phase, and flexible solid-phase are categorized. Furthermore, a comprehensive review of the advances in label-free or label-based SERS strategies and SERS-compatible techniques for the detection of foodborne pathogens is provided, and the advantages and disadvantages of these methods are reviewed.Finally, the current challenges of SERS technology applied in practical applications are listed, and the possible development trends of SERS in the field of foodborne pathogens detection in the future are discussed.

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Facile fabrication of nanoporous gold films for surface plasmon resonance (SPR) sensing and SPR-based SERS

Abstract: Nanoporous gold (NPG) films have both propagating and localized surface plasmon resonance (PSPR and LSPR) effects, and their routine applications for surface-enhanced Raman scattering (SERS) spectroscopy are exclusively based on...

Cited by 22 publications

References 30 publications

Freestanding and Permeable Nanoporous Gold Membranes for Surface-Enhanced Raman Scattering

Freestanding and Permeable Nanoporous Gold Membranes for Surface-Enhanced Raman Scattering

Flexible SERS Substrate with a Ag–SiO₂ Cosputtered Film for the Rapid and Convenient Detection of Thiram

Advances in surface‐enhanced Raman spectroscopy technology for detection of foodborne pathogens

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Facile fabrication of nanoporous gold films for surface plasmon resonance (SPR) sensing and SPR-based SERS

Abstract: Nanoporous gold (NPG) films have both propagating and localized surface plasmon resonance (PSPR and LSPR) effects, and their routine applications for surface-enhanced Raman scattering (SERS) spectroscopy are exclusively based on...

Cited by 22 publications

References 30 publications

Freestanding and Permeable Nanoporous Gold Membranes for Surface-Enhanced Raman Scattering

Freestanding and Permeable Nanoporous Gold Membranes for Surface-Enhanced Raman Scattering

Flexible SERS Substrate with a Ag–SiO2 Cosputtered Film for the Rapid and Convenient Detection of Thiram

Advances in surface‐enhanced Raman spectroscopy technology for detection of foodborne pathogens

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Flexible SERS Substrate with a Ag–SiO₂ Cosputtered Film for the Rapid and Convenient Detection of Thiram