| Summary: | 碩士 === 國立成功大學 === 化學工程學系碩博士班 === 98 === This research includes two parts. In the first part, the adsorption behavior and electrochemical features of an organic thioether— 3,3’-thiobis(1-propanesulfonic acid, sodium salt) (TBPS) on Au(111) electrode were investigated by using cyclic voltammetry (CV) and in-situ scanning tunneling microscopy (STM). Under the investigation of STM, an ordered TBPS adlattice can be observed at 0.8 V (vs. RHE) and the structure is identified to be (6 × 3√3). When the potential was negatively shifted, the TBPS adlayer becomes disorder at ca. 0.7 V and desorbed from the Au(111) surface at ca. 0.06 V. The CV spectrum reveals that the TBPS monolayer adsorbs stably at the potential range between 0.3 V ~ 1.0 V, and oxidizes when the potential was elevated up above 1.2 V.
For the second part of this study, electrochemical deposition of copper was performed on the TBPS-modified Au(111) surface. The CV results indicate that the TBPS adlayer has a slightly enhancement effect to the underpotential deposition (UPD) of copper. For the overpotential deposition (OPD), the modification of TBPS triggers a one dimensional growth mode of copper, formation of copper clusters with rode-like morphology. The presence of the chloride ions has an enhancement effect to the copper deposition both in the UPD and OPD regions. It’s also found that the deposition rate was also affected by the chloride concentration and the rinsing conditions of the TBPS-modified Au(111) substrates after the self-assembling process.
|
|---|
