Surface-Enhanced Raman Scattering-Active Plasmonic Metal Nanoparticle-Persistent Luminescence Material Composite Films for Multiple Illegal Dye Detection

Abstract

Uniform two-dimensional plasmonic nanoparticle (NP)-semiconductor composite films could retard the attenuation of electromagnetic evanescent wave and show intensive Raman activity for the multiplex monitoring of hazards in a practical food matrix. Here, an efficient Raman platform is developed by employing a plasmonic nanoparticle (NP)-persistent luminescence material (PLM) composite film. PLM show upconversion photoluminescence (UCPL) properties. The emitted photons are absorbed by plasmonic NPs, which further boost the surface plasmon resonance for the generation of high polarizability and induce strong electromagnetic strength for surface-enhanced Raman scattering (SERS) enhancement. A UCPL-assisted SERS-enhanced mechanism is proposed and verified. A plasmonic NP-PLM film with superior SERS activity and detection capability becomes an alternative candidate for the sensitive and multiple detection of illegal addition of dyes in a food matrix. The proposed UCPL-assisted SERS-enhanced mechanism provides promising future directions to this end to design a next-generation SERS-active plasmonic NP-PLM composite film for the specific detection in complex samples.

Electroactive and SERS-Active Ag@Cu2O NP-Programed Aptasensor for Dual-Mode Detection of Tetrodotoxin

“…10−12 In particular, metal NPs and metal oxides not only exhibit strong electrochemical activity under mild neutral conditions but also exhibit tunable electrochemical signals by changing the morphology and sizes. Alternatively, Ag NPs and Cu 2 O NPs were found to display tunable electrooxidation signals at around 0.17 and −0.13 V. 19 Importantly, Ag NPs showed best plasmonic properties in the UV−vis regions and also possessed excellent SERS performances, 21,22 and Cu 2 O NPs also displayed Raman activity attributed to the photoinduced electron transfer process between Cu 2 O NPs and the adsorbed probe molecules. 23,24 Dielectric Cu 2 O may affect the plasmonic properties of Ag NPs, and the effects of Cu 2 O NPs on the SERS performances of Ag NPs need to be further studied.…”

“…Alternatively, Ag NPs and Cu 2 O NPs were found to display tunable electrooxidation signals at around 0.17 and −0.13 V . Importantly, Ag NPs showed best plasmonic properties in the UV–vis regions and also possessed excellent SERS performances, , and Cu 2 O NPs also displayed Raman activity attributed to the photoinduced electron transfer process between Cu 2 O NPs and the adsorbed probe molecules. , Dielectric Cu 2 O may affect the plasmonic properties of Ag NPs, and the effects of Cu 2 O NPs on the SERS performances of Ag NPs need to be further studied. Therefore, the integration of Ag and Cu 2 O components into one nanostructure not only exhibited two independent electrooxidation signals at 0.17 and −0.13 V but also possessed promising SERS performances.…”

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

“…The limitations of the PCR and LC–MS are high cost and complicated operation, and the detection signal of the fluorometric assay is easily disturbed by humidity and oxygen in the environment. , The main disadvantage of the colorimetric method is low sensitivity . 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.…”

SERS-Active Composites with Au–Ag Janus Nanoparticles/Perovskite in Immunoassays for Staphylococcus aureus Enterotoxins

“…In order to design strong and stable SERS-active nanostructures, it is necessary to clearly understand in detail the SERS enhancement mechanism, involving electromagnetic (EM) enhancement from plasmonic metal NPs and chemical enhancement from semiconductors. − The composites of plasmonic metal NPs (Au, Ag nanostructures) and semiconductors (involving graphene oxide nanosheets, boron nitride nanosheets, and ZIF-8) would generate collaborative SERS performances, benefiting from the stack effect from EM enhancement and chemical enhancement. ,,− This would vastly enhance the sensitivity of detection. Plasmonic Au–Ag Janus NPs themselves showed inherent and reproducible SERS performances without the extra modification of Raman molecules, owing to the presence of 2-mercaptobenzoimidazole-5-carboxylic acid (MBIA) ligands during the synthesis process .…”