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1 2007

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A Study on the Electrochemical and Structural Properties of a Schiff Base SAM on Au(111) Surface

Kong D. S., Gu K. Q., Feng Y. Y., Qin M.

Polish Journal of Chemistry

2007

Vol. 81, nr 9

1611-1620

The electrochemical and structural properties of Schiff base V-hp self-assembled monolayer (SAM) on Au(111) surface have been studied using electrochemical technique and electrochemical scanning tunneling microscopy (ECSTM) in 0.1 M HClO4 solution. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements revealed that the adlayer of V-hp on Au(111) surface inhibits the oxidization of Au and reduces the surface double-layer capacitance. The electronic charges for V-hp-SAM covered Au(111) electrode, resulting from capacitive charging and discharging process in volved in the double-layer potential region, become one or more orders of magnitude lower than that for bare Au(111). STM investigation demonstrated that V-hp molecules can adsorb with a flat-lying orientation on Au(111) and formed a long-range two-dimensional ordered SAM with a (2 square root 3 x square root 21) adlattice symmetry structure. A model structure with one molecule per unit cell was proposed, which yields a surface concentration of 1.28x10-10 mol/cm2.