A study on the electrochemical and structural properties of a Schiff base SAM on au(111) surface

作者：Kong D S^*; Gu K Q; Feng Y Y; Qin M

来源：Polish Journal of Chemistry, 2007, 81(9): 1611-1620.

• Schiff base
• Au(111)
• molecular adsorption
• SAM

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 involved 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 root 3x 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/cm(2).

• 出版日期2007-9
• 单位曲阜师范大学