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Electrochemical And Topological Characterization Of Gold(111) ∣ Oligo(cyclohexylidene) ∣ Gold Nanocrystal Interfaces

F. Reincke, S. Hickey, J. Kelly, T. W. Braam, L. W. Jenneskens, D. Vanmaekelbergh
Published 2002 · Chemistry

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Self-assembled monolayers (SAMs) of functionalized oligo(cyclohexylidene) molecules on gold(111) surfaces have been studied by measurement of the interfacial capacitance in concentrated electrolyte solutions and by cyclic voltammetry with Fe(CN)6 3 −/4 − as the redox system. The morphology of the layers has been studied by scanning tunneling microscope (STM) and AFM. We found that sulfide-terminated oligo(cyclohexylidenes) form a well-ordered SAM on gold(111) and that the oxime end-functionality inhibits the formation of ordered SAMs. Charge-stabilized gold nanocrystals attach to sulfide-terminated SAMs on gold(111) to form robust gold(111) oligo(cyclohexylidene) gold nanocrystal molecular junctions. We show that the nanocrystal water interface can be charged by electron transport through the molecular layer. © 2001 Published by Elsevier Science B.V.
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