Gradient metal nanoislands as a unified surface enhanced Raman scattering and surface enhanced infrared absorption platform for analytics

Gkogkou, Dimitra; Shaykhutdinov, Timur; Kratz, Christoph; Oates, Thomas W.; Hildebrandt, Peter; Weidinger, Inez M.; Ly, Khoa H.; Esser, N.; Hinrichs, Karsten

doi:10.1039/c9an00839j

Cited by 16 publications

(11 citation statements)

References 33 publications

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“…The band intensities for the resuspended sample are ∼30× more intense than for the samples that were not centrifuged. The bands observed are characteristic of MBN and are the CN stretch at 2230 cm –1 , the C–C stretch at 1585 cm –1 , the C–H bend and C–C stretch at 1180 cm –1 , and the C–S stretch and C–C stretch at 1072 cm –1 . , It is clear from Figure A that centrifugation and resuspension of the Ag-CNF material provide a more active SERS substrate for solution analysis.…”

Section: Resultsmentioning

confidence: 98%

Plasmonic Cellulose Nanofibers as Water-Dispersible Surface-Enhanced Raman Scattering Substrates

Rusin

Bakkari

et al. 2020

ACS Appl. Nano Mater.

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A water-dispersible surface-enhanced Raman scattering (SERS) substrate is developed to provide rapid and reproducible measurement of solution-borne analytes. Cellulose nanomaterials are generally dispersible in water and are known to act as a reducing agent and support for the synthesis of metal nanoparticles. In this work, cellulose nanofibers (CNF) are decorated with Ag nanoparticles to yield plasmonic cellulose nanofibers (Ag-CNF). The chemical reduction of the Ag onto the CNF is explored and characterized. Conditions are optimized in terms of the SERS intensity of a probe species. A process is introduced to produce colloidally stable bundles of the hybrid nanomaterial that contain closely spaced Ag nanoparticles which serve as SERS hot spots. This water-dispersible substrate offers high reproducibility and rapid analysis of analytes that both chemisorb and physisorb to the Ag nanoparticles. Ag-CNF are used to detect rhodamine 6G and malachite green within 2 min. Malachite green is measured at a limit of detection of 80 pM.

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Section: Resultsmentioning

confidence: 98%

Plasmonic Cellulose Nanofibers as Water-Dispersible Surface-Enhanced Raman Scattering Substrates

Rusin

Bakkari

et al. 2020

ACS Appl. Nano Mater.

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“…SEIRA bands are based on the chemical functional groups of analytes as each function group has its unique absorption band within the active mid-IR range (4600–400 cm −1 ); consequently, the SEIRA spectrum is considered a fingerprint for molecules [ 31 ]. These fingerprints can be used for the identification and differentiation of molecules [ 32 ]. In the current method, spherical or semispherical Cit-AgNPs were prepared by the reduction of AgNO 3 using sodium citrate.…”

Section: Resultsmentioning

confidence: 99%

Identification of milk quality and adulteration by surface-enhanced infrared absorption spectroscopy coupled to artificial neural networks using citrate-capped silver nanoislands

2022

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Milk is one of the most important multicomponent superfoods owing to its rich macronutrient composition. It requires quality control at all the production stages from the farm to the finished products. A localized surface plasmon resonance optical sensor based on a citrate-capped silver nanoparticle (Cit-AgNP)–coated glass substrate was developed. The fabrication of such sensors involved a single-step synthesis of Cit-AgNPs followed by surface modification of glass slides to be coated with the nanoparticles. The scanning electron microscope micrographs demonstrated that the nanoparticles formed monolayer islands on glass slides. The developed surface-enhanced infrared absorption spectroscopy (SEIRA) sensor was coupled to artificial neural networking (ANN) for the qualitative differentiation between cow, camel, goat, buffalo, and infants’ formula powdered milk types. Moreover, it can be used for the quantitative determination of the main milk components such as fat, casein, urea, and lactose in each milk type. The qualitative results showed that the obtained FTIR spectra of cow and buffalo milk have high similarity, whereas camel milk resembled infant formula powdered milk. The most difference in FTIR characteristics was evidenced in the case of goat milk. The developed sensor adds several advantages over the traditional techniques of milk analysis using MilkoScan™ such as less generated waste, elimination of pre-treatment steps, minimal sample volume, low operation time, and on-site analysis. Graphical abstract

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“…SEIRA involves application of a conductive film as an overlayer or underlayer to the sample. Metal nanoislands − and metal oxides − have been employed as conductors since their surface plasmon resonances are tunable throughout the near-and mid-infrared region. When the incident light is on resonance with the tuned surface plasmon and the molecular vibration, the IR signal of the molecule can be enhanced.…”

Section: Introductionmentioning

confidence: 99%

Classical Model of Surface Enhanced Infrared Absorption (SEIRA) Spectroscopy

2022

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The molecule–plasmon interaction is the key to the mechanisms of surface enhanced infrared absorption (SEIRA) and surface enhanced Raman scattering (SERS). Since plasmons are well described by Maxwell’s equations, one fundamental treatment involves the classical interpretation of infrared absorption and resonance Raman spectroscopies. We can understand the molecule–plasmon interaction using electromagnetic theory if the classical field effect on a transition dipole moment or transition polarizability is properly described. In previous work, we derived the Raman excitation profile of a model molecule using a classical driven spring attached to a charged mass with a perturbative force constant due to vibrational oscillations. In this study we generalize the interactions of plasmons with molecules by considering the N2O asymmetric stretch SEIRA signal on a Dy doped CdO (CdO:Dy) film. This semiconductor has tunable plasmon dispersion curves throughout the near-and mid-infrared that can interact directly with vibrational absorption transitions. We have demonstrated this using the Kretschmann configuration with a CaF2 prism and a MgO substrate. The model predicts the phase behavior of SEIRA. The calculated enhancement factor relative to an Au control is 6.2, in good agreement with the value of 6.8 ± 0.5 measured under the same conditions.

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Gradient metal nanoislands as a unified surface enhanced Raman scattering and surface enhanced infrared absorption platform for analytics

Abstract: A metal nanoisland layer with varying plasmonic responses offers surface enhanced Raman scattering and infrared absorption optimal sites on a single surface.

Cited by 16 publications

References 33 publications

Plasmonic Cellulose Nanofibers as Water-Dispersible Surface-Enhanced Raman Scattering Substrates

Plasmonic Cellulose Nanofibers as Water-Dispersible Surface-Enhanced Raman Scattering Substrates

Identification of milk quality and adulteration by surface-enhanced infrared absorption spectroscopy coupled to artificial neural networks using citrate-capped silver nanoislands

Classical Model of Surface Enhanced Infrared Absorption (SEIRA) Spectroscopy

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