Surface-Enhanced Raman Scattering

Birke, Ronald L.; Lombardi, John R.

doi:10.1007/978-1-4613-0985-7_6

Cited by 72 publications

(54 citation statements)

References 149 publications

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“…Demethylation of methylviologen to 4,4′-bipyridine has been noted in the literature. 6 The SERS spectra of the cation radical (at -0.8 V) as a function of excitation wavelength are shown in Figure 6. In contrast to those of the dication, the spectra of the cation radical are extremely sharp and highly resolved at all excitation wavelengths.…”

Section: Resultsmentioning

confidence: 99%

Photoreduction of Methylviologen Adsorbed on Silver

1996

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Methylviologen adsorbed on a roughened silver electrode is reduced to its cation radical upon irradiation with laser light at liquid nitrogen temperature. Surface-enhanced Raman scattering (SERS) spectra were obtained with different excitation wavelengths between 406 and 752 nm and compared to those obtained at room temperature in an electrochemical cell under potential control. From two-color experiments, in which one laser frequency was used to generate the radical and a second to excite the SERS spectra, it was determined that radical formation occurs mainly with excitation in the blue spectral region. A comparison of the SERS spectra of the dication and cation radical forms of methylviologen with their solution spectra suggests that the former interacts more strongly with the surface than the latter. The cation radical appears to be stable for several hours in liquid nitrogen but has a short lifetime at room temperature. Two mechanisms for the photoreduction are discussed: plasmon-assisted electron transfer from the metal to the methylviologen dication and formation of a resonance charge transfer complex. The current experimental data are insufficient to determine the particular role of these mechanisms.

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Section: Resultsmentioning

confidence: 99%

Photoreduction of Methylviologen Adsorbed on Silver

1996

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“…SERS is well established and has been the focus of several reviews [10][11][12][13][14][15][16][17][18][19][20]. The origin of the SERS enhancement effect has been the subject of some debate, although it is generally accepted that the primary mechanism of enhancement is amplification of the local electric field due to the resonant excitation of localised surface plasmons in the metal by the incident light, as well as non-resonant lightning rod effects associated with concentrated field lines at sharp surface features [21,22].…”

Section: Ec-sersmentioning

confidence: 99%

Advances in surface-enhanced vibrational spectroscopy at electrochemical interfaces

Wain

O’Connell

2017

Advances in Physics: X

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Electrochemical interfaces are ubiquitous, and characterisation tools that allow us to interrogate them on the molecular scale underpin a wide range of technologies. Because of their dynamic nature, in situ or operando measurement is often necessary, and the coupling of electrochemical techniques with spectroscopic methods is a powerful solution to this challenge. Vibrational spectroscopy in particular can provide important insights into the chemical nature of species adsorbed at electrode surfaces. When combined with electrochemistry, the influence of a potential perturbation to the interface can be studied, helping to build a complete picture of molecular processes in complex electrochemical systems. Here, we review the latest advances in vibrational spectroscopy at electrochemical interfaces, with a focus on surfaceenhanced approaches including surface-enhanced Raman scattering, shell-isolated nanoparticle-enhanced Raman spectroscopy, tip-enhanced Raman spectroscopy and surface-enhanced infrared absorption spectroscopy.

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“…The great advantage of this technique is the combination of a highly increased Raman sensitivity along with the fluorescence quenching that occurs on rough metallic surfaces. [6,7] Recently, SERS has demonstrated its potential in the analysis of organic natural dyes, mostly anthraquinones [8 -11] and flavonoids. [12,13] Few Raman spectra of indanthrone can be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Surface‐enhanced Raman spectroscopy of indanthrone and flavanthrone

Chang

Cañamares

Aydın

et al. 2009

J Raman Spectroscopy

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The normal Raman and surface-enhanced Raman scattering (SERS) spectra of flavanthrone and indanthrone were obtained at several excitation wavelengths. The spectral assignments were aided by density functional calculations. Since both molecules have very high symmetry (C 2h ) including a center of inversion, we expect that the modes of u symmetry will be forbidden in the normal Raman spectrum. However, proximity to the surface causes special SERS enhancement of several of the b u modes, along with somewhat weaker enhancement of the a u and b g modes.

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Surface-Enhanced Raman Scattering

Cited by 72 publications

References 149 publications

Photoreduction of Methylviologen Adsorbed on Silver

Photoreduction of Methylviologen Adsorbed on Silver

Advances in surface-enhanced vibrational spectroscopy at electrochemical interfaces

Surface‐enhanced Raman spectroscopy of indanthrone and flavanthrone

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