Self-Assembly and Autopolymerization of Pyrrole and Characteristics of Electrodeposition of Polypyrrole on Roughened Au(111) Modified by Underpotentially Deposited Copper

Yu Chuan Liu, Thomas C. Chuang

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

By combining techniques of underpotential deposition (UPD) and roughening metal substrates by a triangularwave oxidation-reduction cycle (ORC) which is generally used in surface-enhanced Raman scattering (SERS) studies, and extending applications of self-assembled monolayers (SAMs), copper is underpotentially deposited on electrochemically roughened Au(111) in this study for the first time. The formation of SAMs and further autopolymerization of pyrrole monomers are found on the UPD Cu-modified gold surfaces. The stability of SAMs is significantly improved due to the presence of UPD Cu. Furthermore, electropolymerized polypyrrole (PPy) on this UPD Cu-modified roughened Au demonstrates some distinguishing properties. These include higher conductivities, higher intensity, and better resolution on SERS and improved anti-aging ability in a 50% relative humility, 20% (v/v) O2 atmosphere at 30 °C for 60 days.

Original languageEnglish
Pages (from-to)9802-9807
Number of pages6
JournalJournal of Physical Chemistry B
Volume107
Issue number36
Publication statusPublished - Sep 11 2003
Externally publishedYes

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Pyrroles
polypyrroles
Polypyrroles
pyrroles
Electrodeposition
electrodeposition
Self assembly
self assembly
Copper
Self assembled monolayers
copper
Raman scattering
Raman spectra
Gold
monomers
Aging of materials
Monomers
Metals
gold
atmospheres

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

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abstract = "By combining techniques of underpotential deposition (UPD) and roughening metal substrates by a triangularwave oxidation-reduction cycle (ORC) which is generally used in surface-enhanced Raman scattering (SERS) studies, and extending applications of self-assembled monolayers (SAMs), copper is underpotentially deposited on electrochemically roughened Au(111) in this study for the first time. The formation of SAMs and further autopolymerization of pyrrole monomers are found on the UPD Cu-modified gold surfaces. The stability of SAMs is significantly improved due to the presence of UPD Cu. Furthermore, electropolymerized polypyrrole (PPy) on this UPD Cu-modified roughened Au demonstrates some distinguishing properties. These include higher conductivities, higher intensity, and better resolution on SERS and improved anti-aging ability in a 50{\%} relative humility, 20{\%} (v/v) O2 atmosphere at 30 °C for 60 days.",
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