Surface-enhanced Raman spectra of pyrazine, pyrimidine, and pyridazine adsorbed on silver sols

Muniz‐Miranda, Maurizio; Neto, N.; Sbrana, G.

doi:10.1021/j100315a019

Cited by 84 publications

(63 citation statements)

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“…10 agree well with those from roughened silver electrodes, 17,19 which concluded that the pyrazine was adsorbed onto the substrate in an end-on configuration with probably a slightly tilted configuration. 20 -22 Our SERS spectrum of pyrazine at OCP is also quite similar to the SERS spectrum of pyrazine on the aggregated silver sol reported by Muniz-Miranda et al 40,41 The spectra show several similarities to the aqueous pyrazine spectrum, including the fact that the 1023 cm 1 band is the strongest and is about eight times stronger than the 1595 cm 1 band.…”

Section: Comparison Between the Observed And Calculated Infrared Ramsupporting

confidence: 81%

Surface‐enhanced hyper‐Raman and surface‐enhanced Raman scattering from molecules adsorbed on nanoparticles‐on‐smooth‐electrode (NOSE) substrate I. Pyridine, pyrazine and benzene

Huang

Петров

et al. 2005

J Raman Spectroscopy

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Metal nanoparticles-on-smooth-electrode (NOSE) was used as the substrate in a potential-dependent surface-enhanced hyper-Raman(SEHRS), hyper-Rayleigh(SEHRyS) and Raman (SERS) study of adsorbed molecules of pyridine, pyrazine and benzene. The three molecules are chosen because they are known to adsorb in different orientations on an Ag surface, thus allowing us to examine the sensitivity of SEHRS and SERS signals to the orientation of adsorbed molecules on the NOSE substrate. A computational subroutine is developed and interfaced with Gaussian-98 to calculate the numeric infrared, Raman and hyper-Raman intensities, as well as their projections along any molecular-fixed orientation axis at the level of finite perturbation theory. In this study, we tried to make four types of systematic comparisons. First, we compared the performance of Ag n jAg NOSE substrate with that of traditional substrates such as a randomly roughened Ag electrode or a randomly aggregated Ag sol in SEHRS and SERS. Secondly, we tried to compare between infrared, Raman and hyper-Raman spectra, which represent the parity-differentiated one-photon, two-photon and three-photon processes, respectively, with the aim of examining the complementarity between SEHRS and SERS as well as between SEHRS and infrared absorption. Thirdly, we compared isotropic normal spectra with surface-enhanced spectra (SEHRS and SERS), with the aim of examining the effect of surface adsorption on the selectivity and enhancement. Lastly, we made a systematic comparison between the observed and calculated spectra for both isotropic and surface spectra, which allowed us to assign and interpret the observed data and to infer the most likely orientation of the adsorbed molecules. The NOSE method can be generalized easily to other metal nanoparticles dispersed on a smooth inert metal electrode. The rapid development in the synthesis of metal nanoparticles of various sizes, shapes and crystalline states makes the NOSE method a much more flexible and versatile substrate in the study and applications of SERS and SEHRS techniques.

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Section: Comparison Between the Observed And Calculated Infrared Ramsupporting

confidence: 81%

Surface‐enhanced hyper‐Raman and surface‐enhanced Raman scattering from molecules adsorbed on nanoparticles‐on‐smooth‐electrode (NOSE) substrate I. Pyridine, pyrazine and benzene

Huang

Петров

et al. 2005

J Raman Spectroscopy

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“…The origin of SERS still remains a matter of controversy, though it is now widely accepted that there are two main contributions to the overall effect. One is the classical electromagnetic contribution through the surface plasmon resonance by the exciting electromagnetic field [1] and the other is the chemisorption which involves chargetransfer interaction between the adsorbed molecule and the metal surface [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Concentration-dependent surface-enhanced Raman scattering of 2-benzoylpyridine adsorbed on colloidal silver particles

Chowdhury¹,

Ghosh

2004

Journal of Colloid and Interface Science

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“…The origin of this enhancement is broadly explained in terms of electromagnetic 1 -3 and chemical interactions. 4,5 With the vibrational information available from this technique, the molecular forms and the orientation of the adsorbed species on the metal surfaces can be investigated. 1,6 -9 Since the discovery of SERS, pyridine and its substituted derivatives have been extensively studied, 10 -13 which made a major contribution to the understanding of the SERS mechanism involved in these cases and also in estimating their possible orientations on a roughened silver surface.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of 3‐ and 4‐benzoylpyridine on colloidal silver particles: a surface‐enhanced Raman scattering study

Chowdhury

Ghosh

2004

J Raman Spectroscopy

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Surface-enhanced Raman scattering (SERS) spectra of 3-and 4-benzoylpyridine (BP) adsorbed on silver hydrosols were compared with the FTIR and normal Raman spectra in bulk and in solution. With a small fractional change in adsorbate concentration, the SER spectra of isomeric BPs show significant changes in their features, indicating different orientational changes of the different parts of the flexible molecule on the colloidal silver surface with adsorbate concentration. The appearance of a broad, long-wavelength band in the absorption spectra of the silver sol due to solute-induced coagulation of colloidal silver particles is found to be red shifted with increase in adsorbate concentration. The SER excitation profiles indicate that the resonance of the Raman excitation radiation with the new aggregation band contributes more to the SERS intensity than that with the original sol band.

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Surface-enhanced Raman spectra of pyrazine, pyrimidine, and pyridazine adsorbed on silver sols

Abstract: Raman) for its verification. The low excited-state torsional barriers suggest some possibilities for the photochemical dynamics of this elementary conjugated hydrocarbon.

Cited by 84 publications

References 0 publications

Surface‐enhanced hyper‐Raman and surface‐enhanced Raman scattering from molecules adsorbed on nanoparticles‐on‐smooth‐electrode (NOSE) substrate I. Pyridine, pyrazine and benzene

Surface‐enhanced hyper‐Raman and surface‐enhanced Raman scattering from molecules adsorbed on nanoparticles‐on‐smooth‐electrode (NOSE) substrate I. Pyridine, pyrazine and benzene

Concentration-dependent surface-enhanced Raman scattering of 2-benzoylpyridine adsorbed on colloidal silver particles

Adsorption of 3‐ and 4‐benzoylpyridine on colloidal silver particles: a surface‐enhanced Raman scattering study

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