Etched-spiky Au@Ag plasmonic-superstructure monolayer films for triple amplification of surface-enhanced Raman scattering signals

Liu, Huiqin; Zeng, Junyi; Song, Liping; Zhang, Lingli; Chen, Zihai; Li, Jianhua; Xiao, Zhizhong; Su, Fengmei; Huang, Youju

doi:10.1039/d2nh00023g

Cited by 42 publications

(25 citation statements)

References 52 publications

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“…99 The self-assembly of nanoparticles on a flexible planar substrate has been reported in many studies. 101,102 Huang's group has reported a new fabrication method based on tailoring the contact angle of nanoparticles to assemble the nanoparticles instantly (within 5 s) on silicon wafer. 103 In another study, the same group has reported controlling the SERS intensity of a planar system (containing a monolayer of gold nanoparticles) by adjusting the shrinkage of the substrate through light.…”

Section: Nanomaterials For Sersmentioning

confidence: 99%

Emerging SERS biosensors for the analysis of cells and extracellular vesicles

Yaraki

Wang

2022

Nanoscale

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Section: Nanomaterials For Sersmentioning

confidence: 99%

Emerging SERS biosensors for the analysis of cells and extracellular vesicles

Yaraki

Wang

2022

Nanoscale

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“…Plasmons arising on the surface of metallic nanostructures have allowed manipulation and enhancement of the typical molecular vibrations characteristic of the molecules adsorbed to their surfaces that are to be analyzed. Various groups have explored this plasmonic property and exploited its uses toward the molecular detection of analytes through the phenomenon termed surface-enhanced Raman scattering (SERS), especially through the use of heterometallic nanoparticles, with many of the nanoparticles proving to be much-needed additions to medical imaging and general molecular detection methods. − However, this plasmonic resonance has only been shown to arise in nonferromagnetic metals as well as more reactive alkali and alkaline-earth metal nanostructures. − This is due to Fe and Co’s real component of permittivity being positive, meaning they have weak interaction with incident light that do not allow the generation of surface plasmons, thereby dampening any possible surface plasmon resonance polaritons (SPP) at their metal/dielectric interface. Specifically, a new method of detection has arisen from the hybridized resonance pattern that occurs because of alloying FeCo with a noble metal to create ferroplasmonic nanostructures. , Lopez-Ortega et al have reported the magneto-optical enhancement in metallic Ag/FeCo core/shell nanoparticles with 50 emu/g magnetization .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Magnetoplasmonic Air-Stable Au@FeCo

et al. 2023

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The synthesis of FeCo alloys as highly magnetic nanoparticles has been valuable, as far as applications for magnetic nanoparticles are concerned. However, recently, a field of magnetoplasmonics in which magnetic nanoparticles such as the FeCo alloys doped with plasmonic materials such as Au and Ag to create a hybrid nanostructure with both properties has emerged. These magnetoplasmonic metamaterials have greatly enhanced the limit of detection of analytes in spectroscopic methods, as well as providing a more widely applicable nanoparticle to broaden the use of FeCo alloys even further. Herein, we discuss the synthesis of high-yield and fairly monodisperse spherical FeCo and Au-doped FeCo (Au@FeCo) with varying compositions of Au synthesized via the thermal decomposition of iron pentacarbonyl (Fe(CO) 5 ) and dicobalt octacarbonyl (Co 2 (CO) 8 ), followed by the addition of Au atoms using triphenylphosphine gold(I) chloride ((Ph 3 P)AuCl) via both coprecipitation and by delayed addition methods. The products were separated using a hand-held magnet, and then characterized via ultraviolet−visible light (UV-vis), scanning electron microscopy coupled with energy-dispersive X-ray analysis (SEM-EDX), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), flame atomic absorption spectrometry (F-AAS), and magnetization measurements. Optical studies revealed a plasmonic peak at 550 nm in the Au@FeCo nanoparticles that had a gold content (%Au) of >2% (by weight), determined using F-AAS. Colocation of the Fe, Co, and Au were demonstrated through EDX analysis. Location of the Au atoms in the core were seen through high-resolution bright-field imaging. To understand the use of these nanoparticles for potential application in therapeutics and/or electronics, resistance measurements were performed to assess power loss as a function of frequency. We also achieved magnetization values as high as 150 emu/g and as low as 50 emu/g for gold-loaded samples based on % Au by weight. This paves the way to continue to develop magneto-plasmonic structures chemically using these synthesis strategies.

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“…In contrast, surface-enhanced Raman scattering (SERS) analysis is simple to operate, takes less time to detect, and does not require complex pre-treatment of samples, so it can greatly improve the detection efficiency and shows potential application for SEC detection. − Noble metal nanomaterials have been widely applied in SERS research because of their strong localized surface plasmon resonance (LSPR). ,− LSPR can cause localized electromagnetic (EM) field enhancement, and the EM field enhancement effect is one of the two widely accepted theoretical mechanisms for SERS enhancement . Most SERS sensors rely on the Raman signal of the target itself for quantitative detection or require additional modification of the Raman reporter on the plasmonic nanoprobes to obtain the strong detection signal. − These will lead to the following limitations: (1) The targets without an inherent Raman signal or with low Raman intensity cannot be sensitively detected. (2) The additional modification of Raman reporters may induce unstable SERS signals and are susceptible to the surrounding complex sample matrices.…”

Section: Introductionmentioning

confidence: 99%

Tunable Preparation of SERS-Active Au–Ag Janus@Au NPs for Label-Free Staphylococcal Enterotoxin C Detection

Jin

Zhao

2023

J. Agric. Food Chem.

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Trace staphylococcal enterotoxin C (SEC) in food poses a serious risk to human health, and it is vital to develop a sensitive and accurate approach for SEC monitoring. Herein, a surface-enhanced Raman scattering (SERS) aptasensor was developed for the quantitative detection of SEC. SERS-active gold–silver Janus@gold nanoparticles (Au–Ag Janus@Au NPs) were prepared and showed tunable solid and hollow nanostructures by simply controlling the pH values of the reaction system. Solid Au–Ag Janus@Au NPs exhibited intrinsic and enhanced SERS activity due to the intense plasmonic coupling effect between Au dots and Au–Ag Janus NPs, which was 2.27-fold and 17.46-fold higher than that of Au–Ag Janus NPs and hollow Au–Ag Janus@Au NPs, respectively. The attachment of multiple Au dots also protected Ag islands from oxidization, which increased the stability of Au–Ag Janus@Au NPs. Solid Au–Ag Janus@Au NPs served as a label-free, strong, and stable SERS detection probe and achieved sensitive and reliable detection of SEC. The limit of detection was as low as 0.55 pg/mL. This study will expand the application prospects of label-free SERS detection probes in complex systems for food safety monitoring.

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Etched-spiky Au@Ag plasmonic-superstructure monolayer films for triple amplification of surface-enhanced Raman scattering signals

Abstract: The triple signal amplification for the SERS detection based on 2D monolayer film of etched spiky Au@Ag NPs.

Cited by 42 publications

References 52 publications

Emerging SERS biosensors for the analysis of cells and extracellular vesicles

Emerging SERS biosensors for the analysis of cells and extracellular vesicles

Synthesis and Characterization of Magnetoplasmonic Air-Stable Au@FeCo

Tunable Preparation of SERS-Active Au–Ag Janus@Au NPs for Label-Free Staphylococcal Enterotoxin C Detection

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