Surface-enhanced Raman spectra of the reduction product of 4-cyanopyridine on copper colloids

Coyle, Christine M.; Chumanov, George; Jagodzinski, Paul W.

doi:10.1002/(sici)1097-4555(199808)29:8<757::aid-jrs284>3.0.co;2-a

Cited by 19 publications

(14 citation statements)

References 9 publications

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“…The spectra are closely similar to literature [21,26]. The band assignments are listed in Table 1 [23,25,27,33]. The two strong bands of 2-and 4-CP at ca.…”

Section: Raman Spectra Of Cyanopyridinessupporting

confidence: 79%

“…Lombardi et al investigated the dependence of the SERS intensity on the applied potential and the excitation source for a series of pyridine derivatives [22,23]. The adsorption and electroreduction of 4-CP have also been investigated on silver electrodes [24,25], copper electrodes [26] and colloids [27]. Chang employed time-resolved SERS to demonstrate that the SERS signals of 4-CP responsed instantaneously upon the oxidation of the silver electrode [28,29].…”

Section: Introductionmentioning

confidence: 99%

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Isomer-dependent adsorption of cyanopyridines on platinum probed by surface-enhanced Raman spectroscopy

Yan

Wei

et al. 2011

Journal of Electroanalytical Chemistry

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“…The spectra are closely similar to literature [21,26]. The band assignments are listed in Table 1 [23,25,27,33]. The two strong bands of 2-and 4-CP at ca.…”

Section: Raman Spectra Of Cyanopyridinessupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Isomer-dependent adsorption of cyanopyridines on platinum probed by surface-enhanced Raman spectroscopy

Yan

Wei

et al. 2011

Journal of Electroanalytical Chemistry

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“…The reddish Au colloid (pH 7.0) gave an absorption band around 520 nm. For the Cu colloid, 22 4.5 ml of 0.02 M copper (II) sulfate solution was mixed with 60.0 ml of 0.003 M sodium citrate solution, and 30.0 ml of a freshly prepared 0.02 M solution of sodium borohydride in 0.02 M sodium hydroxide was then added to it. The mixture was quickly stoppered to prevent oxidation from air.…”

Section: Methodsmentioning

confidence: 99%

Surface‐enhanced Raman spectroscopy of imidazole adsorbed on electrode and colloidal surfaces of Cu, Ag, and Au

Loo

Tse

Parsons

et al. 2006

J Raman Spectroscopy

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Surface-enhanced Raman spectra have been obtained from imidazole adsorbed on Cu and Ag electrodes, and on Cu, Ag, and Au colloids at pH ranging from 5.6 to 11.0. For these pHs, the imidazole molecule is coordinated through its unshared electron pair on its 'pyridine' nitrogen to the metal surfaces. On the Cu and Au colloidal systems, the imidazole molecule adsorbs with the ring perpendicular to the metal surface since only in-plane vibrations are observed. On the other hand, both the in-plane and out-of-plane vibrations are observed on the Cu and Ag electrodes, and on the Ag colloid, therefore the adsorbed imidazole is tilted at an angle with respect to the surface normal.

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“…A great number of experimental and theoretical researches have been reported focusing on the enhancement mechanism of SERS . All kinds of SERS‐active experimental systems have been developed to optimize enhancement for applications, such as electrochemically roughened electrodes, metal colloids produced via chemical reduction, and vapor‐deposited metal island films, which are usually used in SERS studies as substrates. Several different factors have been demonstrated to affect the magnitude of the surface enhancement, which contain surface roughness features, surface material, analyte, laser excitation wavelength, and so on.…”

Section: Introductionmentioning

confidence: 99%

DFT study on the influence of electric field on surface‐enhanced Raman scattering from pyridine–metal complex

Zhao

Chen

2013

J Raman Spectroscopy

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The influence of a static external electric field on surface-enhanced Raman scattering is investigated by calculating the Raman spectra and excited state properties of pyridine-Au 20 complex with the density functional theory and time-dependent density functional theory method. The external electric field with orientation parallel (positive) or antiparallel (negative) to the permanent dipole moment is respectively applied on the complex. This field slightly changes the equilibrium geometry and polarizabilities, which results in shifted vibration frequencies and selectively enhanced Raman intensities. The changes of charge transfer (CT) excited states in response to the electric field are visualized by employing the charge difference densities. Further, the energy of charge transfer transition is tuned by electric field to be resonant or not with the incident light, leading to the Raman intensities are enhanced or not enhanced. At the same time, the intensities of vibration modes are sensitive to the orientation of the field. The positive electric field enhances the totally symmetric ring breathing mode (~1009 cm À1 ) but suppresses the trigonal ring breathing mode (~1051 cm À1 ). On the contrary, the mode at 1051 cm À1 is more enhanced than the mode at 1009 cm À1 when the negative electric field is applied on the complex. The Raman spectra could be modulated by tuning the strength and direction of the electric field.

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Surface-enhanced Raman spectra of the reduction product of 4-cyanopyridine on copper colloids

Cited by 19 publications

References 9 publications

Isomer-dependent adsorption of cyanopyridines on platinum probed by surface-enhanced Raman spectroscopy

Isomer-dependent adsorption of cyanopyridines on platinum probed by surface-enhanced Raman spectroscopy

Surface‐enhanced Raman spectroscopy of imidazole adsorbed on electrode and colloidal surfaces of Cu, Ag, and Au

DFT study on the influence of electric field on surface‐enhanced Raman scattering from pyridine–metal complex

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