In situ scanning tunneling microscopy imaging of electropolymerized poly(3,4-ethylenedioxythiophene) on an iodine-modified Au(1 1 1) single crystal electrode

Lorico D.S. Lapitan, Bernard John V. Tongol, Shueh Lin Yau

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12 Scopus citations

Abstract

The electrochemical polymerization of 3,4-ethylenedioxythiophene (EDOT) on an iodine-modified Au(1 1 1) single crystal electrode in aqueous 0.10 M HClO 4 was investigated by cyclic voltammetry (CV) and electrochemical scanning tunneling microscopy (EC-STM). The cyclic voltammetric and EC-STM data revealed the stability of the iodine adlayer provided a suitable potential range for EDOT electropolymerization was controlled at 1.20 V (vs. the reversible hydrogen electrode). EC-STM was used to examine the formation of the PEDOT adlayer on the iodine-modified Au(1 1 1) electrode. In situ electropolymerization of EDOT was carried out by slowly increasing the electrode potential to 1.20 V. This process resulted in the formation of single molecular chains of PEDOT with a diameter of 0.90 nm and lengths of 5-7 nm. Higher resolution STM images further revealed PEDOT nanostructures with bent polymer backbones at angles of 105°, 144° and 180°. The growth of PEDOT multi-layers was observed when the potential was held for a longer time.

Original languageEnglish
Pages (from-to)433-440
Number of pages8
JournalElectrochimica Acta
Volume62
DOIs
StatePublished - 15 Feb 2012

Keywords

  • Au(1 1 1) single crystal electrode
  • In situ scanning tunneling microscopy
  • Iodine-modified Au(1 1 1) electrode
  • PEDOT nanowires
  • Poly(3,4-ethylenedioxythiophene)

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