Direct observation of conformational changes of β-substituted duodecithiophene on a Au(111)-(√3×22) substrate using in situ electrochemical STM in 0.1 M HClO 4

Bernard John V. Tongol, Li Wang, Shueh Lin Yau, Tetsuo Otsubo, Kingo Itaya

Research output: Contribution to journalArticlepeer-review

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Abstract

The adsorption of hexahexylduodecithiophene (12T) on a Au(111) electrode was investigated by using cyclic voltammetry (CV) and in situ electrochemical, scanning tunneling microscopy (EC-STM.) in 0.10 M HCIO 4. Potential control at 0.20 V (vs RHE) revealed adlayer structures of mostly folded and rarely angular (oblique) and extended conformations on a reconstructed Au(111)-(√3×22) surface. The angular and extended conformations predominate when the electrode potential is increased to 0.35 and 0.60 V. Folded structures are still evident, but dynamic STM, studies showed, unfolding of this conformation. With molecular STM. imaging of 12T adlayers, we address the packing arrangement and conformational changes of 12T admolecules on the reconstructed Au(111) electrode surface.

Original languageEnglish
Pages (from-to)982-989
Number of pages8
JournalLangmuir
Volume26
Issue number2
DOIs
StatePublished - 19 Jan 2010

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