Surface enhanced Raman scattering of pyrazine adsorbed on silver colloidal particles

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

doi:10.1016/0022-2860(86)85256-5

Cited by 34 publications

(32 citation statements)

References 5 publications

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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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“…11 The usual pH of the hydrosols was about 9.5 ; acidic conditions of the colloidal solutions were reached by slow addition of up to pH 5.5, without altering HClO 4 the stability of the colloids.…”

Section: Methodsmentioning

confidence: 99%

pH Dependence of the Surface-Enhanced Raman Scattering ofp-Nitroaniline Adsorbed on Silver Sols

Muniz‐Miranda¹

1997

J. Raman Spectrosc.

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The surface-enhanced Raman (SER) scattering of p-nitroaniline adsorbed on silver colloids was investigated and compared with previous results obtained on a silver electrode. The SER spectra change signiÐcantly on varying the pH of the colloidal dispersions and correspond to di †erent adsorbed species identiÐed by comparison with the normal Raman spectra. In acidic medium the neutral molecule is adsorbed on the metal substrate via the nitro group, whereas at alkaline pH p-nitroaniline adsorbs as an anion in a quinonoidic electronic state. 1997

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“…The Ag colloidal nanoparticles with diameters ranging from 10 to 20 nm were suspended in alkaline water solution (pH $ 9). For the SERS measurements, week-aged silver colloids were used, in order to prevent the formation of reduction products [14], and ANP was added to the Ag colloidal dispersions in 10 À4 M concentration.…”

Section: Preparation Of Ag Hydrosolsmentioning

confidence: 99%

SERS and DFT study of nitroarenes adsorbed on metal nanoparticles

Muniz‐Miranda¹,

Pergolese²,

Bigotto³

2007

Vibrational Spectroscopy

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Surface enhanced Raman scattering of pyrazine adsorbed on silver colloidal particles

Cited by 34 publications

References 5 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

pH Dependence of the Surface-Enhanced Raman Scattering ofp-Nitroaniline Adsorbed on Silver Sols

SERS and DFT study of nitroarenes adsorbed on metal nanoparticles

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