Ag colloid–ethanethiol films: spacer-modified substrates for surface-enhanced resonance Raman scattering spectroscopy of chromophoric molecules

Michl, Martin; Vlčková, Blanka; Mojzeš, Peter

doi:10.1016/s0924-2031(98)00084-8

Cited by 11 publications

(17 citation statements)

References 6 publications

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“…Figure 1(b) depicts the FE-SEM photograph of the silver particles deposited from 5:0 Â 10 À7 m 3 hydrosol onto a Si(111) wafer followed by drying in air. It reveals that the particles are spherical with an average size of approximately 30 nm in consistency with the colloidal particles 35,36) prepared by the same method.…”

Section: Resultssupporting

confidence: 74%

Infrared Absorption Enhancement of Octadecanethiol on Colloidal Silver Particles

et al. 2004

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Infrared absorption measurements at normal incidence of radiation have been carried out on octadecanethiol (ODT) deposited from ethanol-water mixed solutions onto colloidal silver particles (ca. 30 nm diameter) on Si(111) substrates. The infrared absorption spectra taken as functions of silver mass thickness and ODT concentration show that the intensities of the CH 2 asymmetric and symmetric stretch modes of ODT are twice enhanced in comparison to those observed in the absence of the particles. The spectra also reveal that at any ODT concentration the absorption intensities exhibit a maximum for a particular mass thickness of the particles, indicating that the enhancement is linked to the aggregation of the particles. Contribution of the surface plasmon resonance apparently does not play a major role in the present systems. Approximately the same magnitude of enhancement is obtained for silver hydrosol particles exposed to ODT from the solution followed by depositing on the substrates. Scanning electron morphological inspection has been done on the aggregates in relation to the enhancement.

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Section: Resultssupporting

confidence: 74%

Infrared Absorption Enhancement of Octadecanethiol on Colloidal Silver Particles

et al. 2004

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“…Ag NP hydrosol was prepared by reduction of silver nitrate by sodium borohydride according to the previously published procedure. 28 A transmission electron microscopy (TEM) image of the dried drop of the hydrosol deposited on a carbon-coated grid for TEM and the distribution of the Ag NPs sizes are shown in Figure S1 in the Supporting Information (SI). The average value of Ag NPs size is 7.5 nm.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…For SERS of SLG on spacer-modified plasmonic NPs, we selected Ag NPs modified by adsorption of ethanethiol (ET) upon formation of Ag-ET surface species, as reported previously. 28 ET that is chemisorbed on Ag NPs at the interface between the aqueous and the dichloromethane phase has been shown to play a dual role: (i) a hydrophobic spacer enveloping the Ag NPs and (ii) a mediator of the 2-D assembling of ET-modified Ag NPs at the interface. 28,29 In the first part of this paper, we report on assembling of glass/SLG/AgNPs-ET hybrid system (constituted by SLG deposited on a glass substrate and overdeposited by a 2-D array of ET-modified Ag NPs) and on the results of its SERS spectral probing at four excitation wavelengths in the 445−780 nm range.…”

Section: ■ Introductionmentioning

confidence: 99%

“…28 ET that is chemisorbed on Ag NPs at the interface between the aqueous and the dichloromethane phase has been shown to play a dual role: (i) a hydrophobic spacer enveloping the Ag NPs and (ii) a mediator of the 2-D assembling of ET-modified Ag NPs at the interface. 28,29 In the first part of this paper, we report on assembling of glass/SLG/AgNPs-ET hybrid system (constituted by SLG deposited on a glass substrate and overdeposited by a 2-D array of ET-modified Ag NPs) and on the results of its SERS spectral probing at four excitation wavelengths in the 445−780 nm range. As the reference systems for evaluation of the SLG and the Ag-ET spectral bands positions and intensities, we employ the glass/SLG and the glass/AgNPs-ET system, respectively.…”

Section: ■ Introductionmentioning

confidence: 99%

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Effect of Ethanethiolate Spacer on Morphology and Optical Responses of Ag Nanoparticle Array–Single Layer Graphene Hybrid Systems

et al. 2017

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Single layer graphene (SLG) and two-dimensional (2-D) plasmonic Ag nanoparticle arrays assembled by chemisorption of ethanethiol (ET) molecules (AgNPs-ET) were employed as components of two types of hybrid systems designed for surface-enhanced Raman scattering (SERS) spectral probing of SLG localized in the vicinity of plasmonic NPs. Both hybrids were characterized by optical microscopy, transmission electron microscopy (TEM), surface plasmon extinction (SPE), and SERS microRaman spectral measurements at four excitation wavelengths spanning the 445-780 nm range. SERS spectral probing of the glass/SLG/AgNPs-ET hybrid prepared by overdeposition of SLG on glass by the array of ET-modified Ag NPs has shown that the chemisorbed ET acts as an efficient molecular spacer between SLG and Ag NPs surface which, in turn, enabled to obtain SERS spectra of SLG unperturbed by doping or strain. TEM imaging and SERS spectral probing of the second hybrid prepared by overdeposition of AgNPs-ET array on glass by SLG revealed removal of the adsorbed ET molecules and annealing of Ag NPs during the SLG deposition. The characteristics of the resulting glass/AgNPs/SLG hybrid system, namely (i) broad distribution of the annealed Ag NPs sizes and shapes, (ii) SPE curve covering the overall visible spectral region, (iii) absence of the ET spectral bands in SERS spectra, and (iv) fairly uniform SERS enhancement of the G and 2D mode of SLG in the 532-780 nm range in the straight sample geometry indicate that this hybrid can provide a suitable platform for investigation of the excitation wavelength dependence of combined SERS/GERS (graphene-enhanced Raman scattering) enhancement experienced by various molecular species brought into contact with SLG in this hybrid. Finally, weak optical effects attributed to increased reflectivity of SLG in the near field of Ag NPs arrays have been observed in the excitation wavelength dependence of the SERS spectra of both types of hybrid systems.

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“…Significant attempts have recently been made to prepare microsurfaces of controlled morphology [5][6][7]. Although such work has been confined to model systems only, genuine information has been obtained by assigning bands in the SERS spectra [8,9]. As reported earlier by these authors, the quality of the metal used to provide the enhancement effect, the techniques used for sample preparation, and the analyte-tometal ratio can significantly influence spectral quality [10].…”

Section: Introductionmentioning

confidence: 99%

Critical evaluation of experimental conditions influencing the surface-enhanced Raman spectroscopic (SERS) detection of substances separated by layer liquid chromatographic techniques

et al. 2000

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SummarySurface-enhanced Raman spectra (SERS) of p-dimethylaminobenzylidenerhodanine have been recorded on silica gel 60 F254 and Si60 F254 Raman TLC plates. Spectra were enhanced by use of a silver sol prepared according to the modified Lee-Meisel procedure. The standard deviations of the intensities and the band ratios for the seven most intense peaks were calculated for 30 parallel measurements. Although the Raman plate gives more reproducible results, several experimental difficulties are encountered in the development of chromatograms. SERS detection ofascorbigen and 1 '-methylascorbigen was performed after chromatography on silica gel 60 F254 TLC and HPTLC plates and on Si60 F254 Raman TLC plates. Traditional development was used for the silica gel 60 F254 TLC plates and Si60 F254 Raman plates, and the personal OPLC technique for the silica gel 60 F254 HPTLC plates. It was found that the SERS spectrum gave information about the indole ring only. Because bonding of the analyte to the stationary phase results in a change in molecular conformation-in contrast with the behaviour of rhodanine-the type of the plate used and the development procedure employed can significantly influence the quality of the SERS spectrum.

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Ag colloid–ethanethiol films: spacer-modified substrates for surface-enhanced resonance Raman scattering spectroscopy of chromophoric molecules

Cited by 11 publications

References 6 publications

Infrared Absorption Enhancement of Octadecanethiol on Colloidal Silver Particles

Infrared Absorption Enhancement of Octadecanethiol on Colloidal Silver Particles

Effect of Ethanethiolate Spacer on Morphology and Optical Responses of Ag Nanoparticle Array–Single Layer Graphene Hybrid Systems

Critical evaluation of experimental conditions influencing the surface-enhanced Raman spectroscopic (SERS) detection of substances separated by layer liquid chromatographic techniques

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