Surface enhanced Raman scattering in electrochemical systems: The complex roles of surface roughness

Pemberton, Jeanne E.; Guy, Anita L.; Sobocinski, Raymond L.; Tuschel, David D.; Cross, Nathan A.

doi:10.1016/0169-4332(88)90072-4

Cited by 87 publications

(69 citation statements)

References 35 publications

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“…11 However, a more controllable and reproducible surface roughness can be generated through the control of the electrochemical oxidation-reduction cycle (ORC) procedures. 12,13 Much of the observed enhancement can be ascribed to the electromagnetic fields at the metal surfaces, 14,15 which is quite well understood. The remainder can be ascribed to the chemical enhancement 16,17 concerning charge transfer on the adsorbate-metal surface, which is poorly understood compared with electromagnetic enhancement.…”

Section: Introductionmentioning

confidence: 98%

Improved surface‐enhanced Raman scattering of polypyrrole electrodeposited on roughened substrates composed of Au–Ag bimetallic nanoparticles

Chuang

Liu

Wang

2005

J Raman Spectroscopy

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We report here the first electrochemical method to prepare a roughened gold substrate with bimetallic silver and gold nanoparticles. First, a silver substrate was roughened by a triangular-wave oxidation-reduction cycle in 0.1 N HCl aqueous solutions. Silver-containing complexes were found in the solution after the ORC treatment. Then a gold substrate was subsequently roughened by a similar oxidation-reduction treatment in this solution. Scanning electron microscopy and atomic force microscopy reveal that the surface of the roughened gold was intrinsically modified with silver nanoparticles, which demonstrates two different kinds of deposition domains. Encouragingly, surface-enhanced Raman scattering of polypyrrole electrodeposited on the roughened gold substrate, modified with finer silver nanoparticles, exhibits an eightfold higher intensity.

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Section: Introductionmentioning

confidence: 98%

Improved surface‐enhanced Raman scattering of polypyrrole electrodeposited on roughened substrates composed of Au–Ag bimetallic nanoparticles

Chuang

Liu

Wang

2005

J Raman Spectroscopy

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“…The role of chloride or other co-adsorbed species on the positively charged Ag surface has been predicted and experimentally verified. 15,16 This enhancement originates from the induction of positive charges on silver surfaces by the co-adsorbed chloride, which leads to an increase in the interaction between the molecule and the silver surface. Figures 4(b), 4(c) and 4(d) show that the relative intensities increase gradually with increasing concentrations of chloride.…”

Section: Resultsmentioning

confidence: 99%

Surface-enhanced Raman Spectroscopy of Quinomethionate Adsorbed on Silver Colloids

Kim¹,

Kang²,

Park³

et al. 2003

Bulletin of the Korean Chemical Society

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We have studied the surface-enhanced Raman spectroscopy (SERS) spectrum of quinomethionate (6-methyl-1,3-dithiolo[4,5-b]quinoxalin-2-one), which is an insecticide or fungicide used on vegetables and wheat. We observed no signals in the ordinary Raman spectra of solid-state quinomethionate, but when it was adsorbed on a colloidal silver surface, strong vibrational signals were obtained at a very low concentration. The SERS spectra were obtained by silver colloids prepared by the Creighton et al. method. The influence of pH and the aggregation inductors (Cl − , Br− , F − ) on the adsorption mechanism was investigated. Two different adsorption mechanisms were deduced, depending on the experimental conditions: The one N atom or two N atoms are chemisorbed on an Ag surface. An important contribution of the chemical mechanism was inferred when the one N atom was perpendicularly adsorbed on a surface. It is possible that quinomethionate can be detected to about 10 −5 M.

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“…Meanwhile, many efforts have been made on finding out the optimum ORC procedure in ORC [6,10,13,27,28]. As reported in the literature [11,16,19,28,29], anions-containing complexes of metals, which were distinguishable from bulk metals, were easily formed during the ORC treatment. It was also found that the SERS activity is much more stable when the constituents of the complex are simultaneously present [23].…”

Section: Introductionmentioning

confidence: 98%

“…Numerous methods can be used to obtain rough metals substrates, including plasma treatment [11], sputtering coating [3,15], mechanically polishing by using abrasives [16] and vacuum evaporation deposition [4,9,12,17,18]. However, a controllable and reproduced surface roughness can be generated through control of the electrochemical oxidation-reduction cycles (ORC) procedure [19]. Therein potential sweep ORC [5,13,19,20] is most popularly used since it can further improve the surface homogeneity [13,21].…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Cl‐ and Au‐Containing Nanocomplex and Its Effect on the Following Electrodeposition of Polypyrrole

Liu

Liang

2003

Electroanalysis

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In this study, polypyrrole (PPy) films were electrochemically deposited on gold substrates roughened by a triangularwave oxidation-reduction cycle (ORC) with different anodic and cathodic vertexes in an aqueous solution containing 0.1 N NaCl. In ORC treatment, the Cl-and Au-containing nanocomplex was formed on the surface of gold. The results indicate that the crystalline orientation and diameter of Au are significantly different before and after ORC treatment. Also the redox behavior in ORC, surface morphology formed and depth profile of Cl in the nanocomplex are influenced by the anodic and cathodic vertexes used in roughening Au. The roughened Au demonstrates an electrocatalytic activity for pyrrole polymerization. Correspondingly, the characteristics of PPy films electrodeposited on these roughened Au substrates are notable. They include the surface-enhanced Raman scattering (SERS) effect shown, a higher conductivity obtained and an increase in oxidation level demonstrated.

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Surface enhanced Raman scattering in electrochemical systems: The complex roles of surface roughness

Cited by 87 publications

References 35 publications

Improved surface‐enhanced Raman scattering of polypyrrole electrodeposited on roughened substrates composed of Au–Ag bimetallic nanoparticles

Improved surface‐enhanced Raman scattering of polypyrrole electrodeposited on roughened substrates composed of Au–Ag bimetallic nanoparticles

Surface-enhanced Raman Spectroscopy of Quinomethionate Adsorbed on Silver Colloids

Characteristics of Cl‐ and Au‐Containing Nanocomplex and Its Effect on the Following Electrodeposition of Polypyrrole

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