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National Chung Hsing University Institutional Repository - NCHUIR > 工學院 > 化學工程學系所 > 依資料類型分類 > 期刊論文 >  3-Mercapto-1-propanesulfonic acid and Bis(3-sulfopropyl) Disulfide Adsorbed on Au(111): In Situ Scanning Tunneling Microscopy and Electrochemical Studies

Please use this identifier to cite or link to this item: http://nchuir.lib.nchu.edu.tw/handle/309270000/129428

標題: 3-Mercapto-1-propanesulfonic acid and Bis(3-sulfopropyl) Disulfide Adsorbed on Au(111): In Situ Scanning Tunneling Microscopy and Electrochemical Studies
作者: Jian, Z.Y.;Chang, T.Y.;Yang, Y.C.;Dow, W.P.;Yau, S.L.;Lee, Y.L.
竇維平
關鍵字: self-assembled monolayers;copper electrodeposition;gold surfaces;adsorption;spectroscopy;chloride;films;au;alkanethiols;decanethiol
日期: 2009
Issue Date: 2012-12-07 15:28:28 (UTC+8)
關連: Langmuir, Volume 25, Issue 1, Page(s) 179-184.
摘要: 3-Mereapto-1-propanesulfonic acid (MPS) and bis(3-sulfopropyl)disulfide (SPS) adsorbed on a Au(111) electrode were studied by using in situ scanning tunneling microscopy (STM). Although the adsorptions of MPS and SPS arc known to be oxidative and reductive, respectively, on an Au(111) electrode, these two admolecules behave similarly in terms of phase evolution, surface coverage, potential for stripping, and characteristics of cyclic voltammetry. However, different adsorption mechanisms of these molecules result in different structures. Raising electrode potential causes more MPS and SPS molecules to adsorb, yielding ordered adlattices between 0.67 and 0.8 V (vs reversible hydrogen electrode). The ordered adlattices of MPS and SPS appear as striped and netlike structures with molecules adsorbed parallel to the Au(111) surface. Switching potential to 0.9 V or more positive still does not result in upright molecular orientation, possibly inhibited by electrostatic interaction between the end group Of -SO(3)(-) and the Au(111) electrode. Lowering the potential to 0.4 V disrupted the ordered adlayer. Stripping voltammetric experiments show that MPS and SPS admolecules are desorbed from Au(111) at the same potential, suggesting that these molecules are both adsorbed via their sulfur headgroups. The S-S bond in SPS is likely broken upon its adsorption on Au(111).
Relation: Langmuir
Appears in Collections:[依資料類型分類] 期刊論文
[依教師分類] 竇維平

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