Stabilization of hydroxyl-group-terminated SERS-marker molecules on μAg particles by silanization

Xia, Lixin; Kim, Nam Hoon; Kim, Kwan

doi:10.1016/j.jcis.2006.10.012

Cited by 13 publications

(16 citation statements)

References 40 publications

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“…For the Ag nanoaggreates, the best SERS enhancement was obtained mainly due to enormously enlarging the amount of contact spots between every pair of particles from the formation of inner planar structures by comparing with the silver nanoparticles coated on a glass substrate and the mAg powders, here the silver nanoparticles coated on a glass substrate are approximately spheroidal in shape with particle size ranging from 300 to 600 nm (see Fig. 5) and the micromorphology of mAg powders is irregular (data not shown) [29].…”

Section: Resultsmentioning

confidence: 95%

“…6 can thus be attributed to 4-MPH adsorbed on Ag. The intense Raman signals at about 1076 and 1599 cm À1 arise from the ring breathing and the ring 8a band of 4-MPH, respectively [29], though the relative spectral intensities are somewhat different between mAg powders and the Ag nanoaggreates. Surprisingly, the Raman peak intensities of 4-MPH band at $1076 cm À1 adsorbed on the Ag nanoaggreates in Fig.…”

Section: Resultsmentioning

confidence: 96%

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Design and construction of a sensitive silver substrate for surface-enhanced Raman scattering spectroscopy

Xia

Wang

Tong

et al. 2008

Vibrational Spectroscopy

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 96%

Design and construction of a sensitive silver substrate for surface-enhanced Raman scattering spectroscopy

Xia

Wang

Tong

et al. 2008

Vibrational Spectroscopy

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“…In the previous report, self‐assembled monolayers of 4MPBA were labile in basic solution, in which the terminal B–C bonds would cleave to yield 4‐mercaptophenol (4MP) by treatment with hydroxide ions and strongly basic amine nucleophiles. Considering that the pH value of the Ag colloidal solution was neutral and the SERS spectra of 4MP should be significantly different from that of TP, we found that not 4MP but TP should be formed on AgNPs. Considering that AgNPs may produce unstable reactive oxygen species, it is expected that 4MPBA may undergo deboronation surface reactions.…”

Section: Resultsmentioning

confidence: 99%

Glucose‐induced and fructose‐induced deboronation reaction of 4‐mercaptophenylboronic acid assembled on silver investigated by surface‐enhanced Raman scattering

Lam

Bao

et al. 2016

Surface & Interface Analysis

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We examined the deboronation reaction of 4-mercaptophenylboronic acid (4MPBA) via fructose and glucose on silver surfaces by means of surface-enhanced Raman scattering (SERS) at the excitation wavelengths of 488, 514, and 633 nm. The SERS spectra on silver nanoparticles clearly exhibited specific spectral signatures of thiophenol (TP) peaks, indicating a deboronation reaction of 4MPBA on the surfaces, whereas no strong TP peaks were observed on gold nanoparticles. The vibrational bands at 417, 999, 1021, and 1574 cm À1 in the Ag SERS spectra could correspond to the in-plane aromatic ring modes in TP. X-ray photoelectron spectroscopy also supported the surface reaction on Ag by referring the B1s peaks at~193 eV. The ratiometric Raman measurements of the band at 1574 cm À1 , with respect to that at 1587 cm À1 , revealed fructose and glucose quantification in the concentration range of 1-10 mM. We did not identify such changes for mannose, sucrose, and sialic acid. The SERS peaks of 4MPBA on roughened Ag plates also exhibited TP bands to show the time-dependent spectral change. Our findings indicate that the deboronation of 4MPBA and conjugation with fructose and glucose may be facilitated efficiently on silver surfaces for their quantification.

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“…SERS spectra can be calibrated with respect to the spectral features of the IS, allowing the normalized intensity of analyte peaks to serve as proxy for the relative concentration of analyte to IS. There are several schemes for the use of IS, including core-molecule-shell nanoparticle (CMS NP) systems [10][11][12] and simple surface adsorption systems. CMS NPs can be useful because the IS is protected from the surrounding environment, affording no opportunity for surface site replacement.…”

Section: Introductionmentioning

confidence: 99%

Quantitative surface-enhanced Raman spectroscopy for kinetic analysis of aldol condensation using Ag–Au core–shell nanocubes

Weatherston

Worstell

2016

Analyst

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Surface-enhanced Raman spectroscopy (SERS) is a powerful tool with high potential for multiplexed detection of dilute analytes. However, quantitative SERS of kinetic assays can be difficult due to the variation in enhancement factors caused by changing reaction conditions. We report a method for quantitative SERS kinetic analysis using colloidal Ag-Au core-shell nanocubes (Ag@AuNCs) as the SERS substrate. This substrate is mass producible, possesses large SERS enhancement, and is resistant to degradation in most environments. The SERS enhancement of the Ag@AuNCs was evaluated both experimentally and computationally. Quantitation was achieved by covalently attaching a non-reactive internal standard (IS) to substrate surfaces and normalizing SERS spectra to the IS signal. We demonstrated that IS normalization corrects for temporal variations in enhancement factor and particle concentration. Quantitation was demonstrated by monitoring the base-catalyzed aldol condensation of surface-bound 4-(methylthio)benzaldehyde with free acetone. The kinetic model of this reaction was fitted to IS normalized SERS data, resulting in kinetic parameters that agreed well with published values. This SERS platform is a robust and sensitive method for quantitative analysis of kinetic assays, with potential applications in many fields.

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Stabilization of hydroxyl-group-terminated SERS-marker molecules on μAg particles by silanization

Cited by 13 publications

References 40 publications

Design and construction of a sensitive silver substrate for surface-enhanced Raman scattering spectroscopy

Design and construction of a sensitive silver substrate for surface-enhanced Raman scattering spectroscopy

Glucose‐induced and fructose‐induced deboronation reaction of 4‐mercaptophenylboronic acid assembled on silver investigated by surface‐enhanced Raman scattering

Quantitative surface-enhanced Raman spectroscopy for kinetic analysis of aldol condensation using Ag–Au core–shell nanocubes

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