Enhancement in the Raman scattering of polypyrrole electrodeposited on roughened gold substrates coated with gold monolayers

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Abstract

In this study, polypyrrole (PPy) films were electrodeposited on gold substrates roughened by a triangular-wave oxidation-reduction cycle (ORC) in an aqueous solution containing 0.1 N HCl. Extending the applications of self-assembled monolayers, gold monolayers were then adsorbed onto PPy films by dipping the PPy-deposited gold substrates into Au complex-containing solutions, which were produced from the ORC procedure used in roughening the gold substrates. Encouragingly, the surface-enhanced Raman scattering (SERS) spectroscopy of PPy with this sandwiched structure, Au monolayers/PPy/roughened Au substrate, exhibits a higher intensity by 1 order of magnitude and a better resolution, as compared with the normal SERS of PPy electrodeposited on a roughened Au substrate. The enhanced SERS effects can be explained as the electromagnetic effect that correlates to both the Au monolayers above and the roughened Au substrate underneath. Moreover, the chemical effect, which is also contributive to the enhanced SERS effects, is first found from the phenomenon of charge transfer from the pyrrolylium nitrogen to the adsorbed Au-containing complex.

Original languageEnglish
Pages (from-to)2948-2952
Number of pages5
JournalJournal of Physical Chemistry B
Volume108
Issue number9
Publication statusPublished - Mar 4 2004
Externally publishedYes

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polypyrroles
Polypyrroles
Gold
Raman scattering
Monolayers
Raman spectra
gold
augmentation
Substrates
Magnetoelectric effects
oxidation
cycles
chemical effects
Self assembled monolayers
dipping
polypyrrole
Charge transfer
Nitrogen
charge transfer
Spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

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title = "Enhancement in the Raman scattering of polypyrrole electrodeposited on roughened gold substrates coated with gold monolayers",
abstract = "In this study, polypyrrole (PPy) films were electrodeposited on gold substrates roughened by a triangular-wave oxidation-reduction cycle (ORC) in an aqueous solution containing 0.1 N HCl. Extending the applications of self-assembled monolayers, gold monolayers were then adsorbed onto PPy films by dipping the PPy-deposited gold substrates into Au complex-containing solutions, which were produced from the ORC procedure used in roughening the gold substrates. Encouragingly, the surface-enhanced Raman scattering (SERS) spectroscopy of PPy with this sandwiched structure, Au monolayers/PPy/roughened Au substrate, exhibits a higher intensity by 1 order of magnitude and a better resolution, as compared with the normal SERS of PPy electrodeposited on a roughened Au substrate. The enhanced SERS effects can be explained as the electromagnetic effect that correlates to both the Au monolayers above and the roughened Au substrate underneath. Moreover, the chemical effect, which is also contributive to the enhanced SERS effects, is first found from the phenomenon of charge transfer from the pyrrolylium nitrogen to the adsorbed Au-containing complex.",
author = "Liu, {Yu Chuan}",
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AU - Liu, Yu Chuan

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N2 - In this study, polypyrrole (PPy) films were electrodeposited on gold substrates roughened by a triangular-wave oxidation-reduction cycle (ORC) in an aqueous solution containing 0.1 N HCl. Extending the applications of self-assembled monolayers, gold monolayers were then adsorbed onto PPy films by dipping the PPy-deposited gold substrates into Au complex-containing solutions, which were produced from the ORC procedure used in roughening the gold substrates. Encouragingly, the surface-enhanced Raman scattering (SERS) spectroscopy of PPy with this sandwiched structure, Au monolayers/PPy/roughened Au substrate, exhibits a higher intensity by 1 order of magnitude and a better resolution, as compared with the normal SERS of PPy electrodeposited on a roughened Au substrate. The enhanced SERS effects can be explained as the electromagnetic effect that correlates to both the Au monolayers above and the roughened Au substrate underneath. Moreover, the chemical effect, which is also contributive to the enhanced SERS effects, is first found from the phenomenon of charge transfer from the pyrrolylium nitrogen to the adsorbed Au-containing complex.

AB - In this study, polypyrrole (PPy) films were electrodeposited on gold substrates roughened by a triangular-wave oxidation-reduction cycle (ORC) in an aqueous solution containing 0.1 N HCl. Extending the applications of self-assembled monolayers, gold monolayers were then adsorbed onto PPy films by dipping the PPy-deposited gold substrates into Au complex-containing solutions, which were produced from the ORC procedure used in roughening the gold substrates. Encouragingly, the surface-enhanced Raman scattering (SERS) spectroscopy of PPy with this sandwiched structure, Au monolayers/PPy/roughened Au substrate, exhibits a higher intensity by 1 order of magnitude and a better resolution, as compared with the normal SERS of PPy electrodeposited on a roughened Au substrate. The enhanced SERS effects can be explained as the electromagnetic effect that correlates to both the Au monolayers above and the roughened Au substrate underneath. Moreover, the chemical effect, which is also contributive to the enhanced SERS effects, is first found from the phenomenon of charge transfer from the pyrrolylium nitrogen to the adsorbed Au-containing complex.

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