Molecular Assembly and Electropolymerization of 3,4-Ethylenedioxythiophene on Au(111) Single Crystal Electrode as Probed by In Situ Electrochemical STM in 0.10 M HClO(4)

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50751

Title:	Molecular Assembly and Electropolymerization of 3,4-Ethylenedioxythiophene on Au(111) Single Crystal Electrode as Probed by In Situ Electrochemical STM in 0.10 M HClO(4)
Authors:	Lapitan,LDS;Tongol,BJV;Yau,SL
Contributors:	化學學系
Keywords:	SCANNING-TUNNELING-MICROSCOPY;X-RAY-ABSORPTION;CYCLIC VOLTAMMETRY;THERMAL-DESORPTION;RESOLUTION STM;THIOPHENE;ADSORPTION;MONOLAYERS;GROWTH;GOLD
Date:	2010
Issue Date:	2012-03-27 18:09:18 (UTC+8)
Publisher:	國立中央大學
Abstract:	We have used electrochemical scanning tunneling microscopy (EC-STM) to obtain molecular insights on the adlayer structures and electrochemical polymerization of 3,4-ethylenedioxythiophene (EpoT) on a bare Au(111) single crystal electrode in 0.1 M HClO(4) solution. Cyclic voltammetric (CV) studies showed an increase in anodic current at 0.90 V with the oxidation of EDOT monomer occurring at E = 1.10 V (vs reversible hydrogen electrode). In situ STM revealed, for the first time, that EDOT molecules can spontaneously form organized adlayers on a bare Au(111) surface with 18 mu M concentration of EpoT in aqueous solution. Molecularly resolved STM images of the EDOT adlayer showed two domains consisting of disordered and ordered structures with the formation of vacancy islands or "etch pits". Several EpoT structures were observed at +0.60 V. namely, (4 x 7), (5 x root 37), and (root 7 x 3) with calculated coverages of 0.107, 0.114, and 0.111 ML, respectively. Electropolymerization was also carried out using in situ STM in 0.10 M HClO(4) under potential control.
Relation:	LANGMUIR
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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