Effect of Chloride Ions on the Adsorption of 3-Mercapto-1-propanesulfonic acid and Bis(3-sulfopropyl)-disulfide on a Au(111) Surface

NCU Institutional Repository > 理學院 > 化學學系 > 期刊論文 > Item 987654321/50693

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/50693

题名:	Effect of Chloride Ions on the Adsorption of 3-Mercapto-1-propanesulfonic acid and Bis(3-sulfopropyl)-disulfide on a Au(111) Surface
作者:	Liu,YF;Lee,YL;Yang,YC;Jian,ZY;Dow,WP;Yau,SL
贡献者:	化學學系
关键词:	SELF-ASSEMBLED MONOLAYERS;SCANNING-TUNNELING-MICROSCOPY;COPPER ELECTROPLATING BATH;LIGHT-EMITTING-DIODES;IN-SITU STM;4,5-DITHIAOCTANE-1,8-DISULFONIC ACID;ELECTROCHEMICAL DETECTION;MERCAPTOPROPIONIC ACID;GOLD ELECTRODE;CHEMISTRY
日期:	2010
上传时间:	2012-03-27 18:08:04 (UTC+8)
出版者:	國立中央大學
摘要:	In situ scanning tunneling microscopy (STM) and cyclic voltammetry (CV) were used to study the adsorption of 3-mercapto-1-propanesulfonic acid (MPS) and bis(3-sulfopropyl)-disulfide (SPS) on Au(111) electrode in a HClO(4) aqueous solution. Chloride ions were introduced into the electrolyte solution, and their effect on the adsorption behavior of MPS and SPS was investigated. The CV results show that SPS and MPS molecules preferentially adsorb on the Au(111) surface compared to chloride ions, and furthermore, chloride ion can induce the adsorption of thiol molecules on the Au(111) surface. In the absence of chloride, no adsorption phase of SPS (or MPS) adlayer can be imaged by STM at low potentials. Raising electrode potential leads to the appearance of disordered adsorption phase at ca. 0.4 V (vs RH E) and ordered adlattices at ca. 0.8 V. In the presence of chloride, ordered adsorption structures of SPS and MPS appear at a lower potential (0.2 V), implying the enhancement effect of chloride to the thiol adsorption. It is inferred that the presence of chloride ions triggers a more positively charged gold surface, enhancing the reaction rate of thiol adsorption. Furthermore, the presence of chloride also leads to a decrease in the thiol electrolyte interaction, due to the high solvation effect of chloride ions, which promotes the adsorption of SPS and MPS onto the Au surface. With further elevation of electrode potential, electrostatic interaction leads to coadsorption of chloride ions into the adlayer, as well as orientation changes of the ad-molecules. As a result, the ordered adlattice was disrupted and disappeared at ca. 0.5 V.
關聯:	LANGMUIR
显示于类别:	[化學學系] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	612	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....