The blocking and structural properties of a Schiff base self-assembled monolayer on the surface of Au(111) |
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Authors: | De-Sheng Kong Zhang-Yu Yu Shi-Ling Yuan |
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Institution: | (1) Department of Chemistry, Qufu Normal University, 273165 Qufu, Shandong, China;(2) Department of Chemistry, Shandong University, 250100 Jinan, Shandong, China |
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Abstract: | Electrochemistry and in situ electrochemical scanning tunneling microscopy (STM) were used to study the blocking and structural properties of Shiff base V-ape-V self-assembled monolayers (SAMs) on the surface of Au(111) in perchloric acid solution. The complex-plane impedance plots for the SAM covered Au(111) electrodes, with the redox couple of Fe(CN)64–/3– present in solution, exhibit arc shapes, revealing that the electrochemical kinetics were controlled by the electron-transfer step. For bare Au(111), the electrode process was mass transport limited. The molecules adsorb on Au(111) with a flat-lying orientation and form a long-range well-defined adlayer. A new structure of
was observed in the double-layer potential region. A structural model is proposed to interpret the molecular registry with Au(111) substrate. |
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Keywords: | Cyclic voltammetry Electrochemical impedance spectroscopy STM SAMs Blocking property |
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