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Direct Observation of Conformational Changes of beta-Substituted Duodecithiophene on a Au(111)-(root 3 x 22) Substrate Using in Situ Electrochemical STM in 0.1 M HClO(4) RID A-6557-2010

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


Journal:
LANGMUIR


Issue Date:
2010


Abstract(summary):

The adsorption of hexahexylduodecithiophene (12T) on a Au(111) electrode was investigated by using Cyclic voltammetry (CV) and in situ electrochimal scanning tunneling microscopy (EC-STM) in 0.10 M HClO(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)-(root 3x22) surf ace. 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.


Page:
982---989


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