Effect of preparation conditions for roughening gold substrate by oxidation-reduction cycle on the surface-enhanced Raman spectroscopy of polypyrrole

Yu Chuan Liu, Bing Joe Hwang, Wen Jie Jian

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The surface-enhanced Raman spectroscopy (SERS) of polypyrrole (PPy) can be obtained by roughening the Au substrate with electrochemical oxidation-reduction cycle (ORC) before PPy deposition. The optimum condition for obtaining SERS effect is based on the strongest peak of C=C backbone stretching of PPy located at ca. 1600 cm-1 shown in SERS. The optimum preparation conditions are as follows. Cathodic and anodic vertex potentials are -300 and 1200 mV vs. SCE, respectively. Delays at cathodic and anodic vertex potentials are 10 and 2 s, respectively. Cathodic and anodic scan rates are 500 and 1000 mVs-1, respectively. The ORC cycle is 25 times. Also, the result indicates that the SERS effect decreases with increasing the charge passed for PPy deposition.

Original languageEnglish
Pages (from-to)129-134
Number of pages6
JournalMaterials Chemistry and Physics
Volume73
Issue number2-3
DOIs
Publication statusPublished - Jan 15 2002
Externally publishedYes

Keywords

  • Oxidation-reduction cycle
  • Polypyrrole
  • Surface-enhanced Raman spectroscopy

ASJC Scopus subject areas

  • Materials Chemistry

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