Electrochemical and STM Studies of 1-Thio-尾-d-glucose Self-Assembled on a Au(111) Electrode Surface

详细信息    查看全文

• 作者：Annia H. Kycia ; Slawomir Sek ; Zhangfei Su ; A. Rod Merrill ; Jacek Lipkowski
• 刊名：Langmuir
• 出版年：2011
• 出版时间：November 1, 2011
• 年：2011
• 卷：27
• 期：21
• 页码：13383-13389
• 全文大小：936K
• 年卷期：v.27,no.21(November 1, 2011)
• ISSN：1520-5827

文摘

In this study, a Au(111) electrode is functionalized with a monolayer of 1-thio-尾-d-glucose (尾-Tg), producing a hydrophilic surface. A monolayer of 尾-Tg was formed on a Au(111) surface by either (1) potential-assisted deposition with the thiol in a supporting electrolyte or (2) passive incubation of a gold substrate in a thiol-containing solution. For each method, the properties of the 尾-Tg monolayer were investigated using cyclic voltammetry (CV), differential capacitance (DC), and chronocoulometry. In addition, electrochemical scanning tunneling microscopy (EC-STM) was used to obtain images of the self-assembled monolayer with molecular resolution. Potential-assisted assembly of 尾-Tg onto a Au(111) electrode surface was found to be complicated by oxidation of 尾-Tg molecules. The EC-STM images revealed formation of a passive layer containing honeycomb-like domains characteristic of a formation of S<sub>8sub> rings, indicating the S鈥揅 bond may have been cleaved. In contrast, passive self-assembly of thioglucose from a methanol solution was found to produce a stable, disordered monolayer of 尾-Tg. Since the passive assembly method was not complicated by the presence of a faradaic process, it is the method of choice for modifying the gold surface with a hydrophilic monolayer.