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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Adsorption behavior of 11-mercapto-1-undecanol on Au(111) electrode in an electrochemical system
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Adsorption behavior of 11-mercapto-1-undecanol on Au(111) electrode in an electrochemical system

机译：电化学系统中11-巯基-1-十一烷醇在Au（111）电极上的吸附行为

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摘要

In-situ scanning tunneling microscopy (STM) and cyclic voltammetry (CV) were used to study the phase evolution of 11-mercapto-1-undecanol (MUO) adlayer on an Au(111) electrode. The effect of various electrolytes, including HClO4 and H2SO4, on the adsorption behavior was studied. The MUO adsorption was found to initiate mainly at the intersectional corner of herringbone rows of an Au(111) reconstruction structure in both of the electrolytes. The following growth of an adsorbed cluster develops first along the face-centeredcubic (fcc) position of the herringbone structure. In the HClO4 solution, the MUO molecule is first adsorbed in a flat-lying orientation when the dose concentration of MUO is low, growing to an ordered domain of striped structure (beta phase) with a molecular arrangement of (12 x root 3). When the surface coverage becomes high, the hydrocarbon chains of MUO lift off from the Au(111) plane, forming a more condensed and saturated phase, the D phase, identified as (root 3 x root 3)R30 degrees. At a high dose concentration of MUO, however, the striped phase does not appear. Due to the fast adsorption of thiol groups at high dose concentrations, the hydrocarbon chains-gold interaction is inhibited, and therefore, a flat-lying orientation of MUO molecules cannot be obtained. In the H2SO4 solution, the striped phase does not form even at a low dose concentration and, instead, the phi phase appears directly in the low-coverage stage. The distinct phenomena observed for the two electrolytes are attributed to the different interactions of anionic ions with the gold surface. It has been shown that sulfate ions adsorb more strongly than perchlorate ions on a gold surface. The strongly adsorbed sulfate ions in the electrical double layer are supposed to resist the direct contact of hydrocarbon chain with the gold surface which also prevents the formation of a flat-lying orientation.
机译：原位扫描隧道显微镜（STM）和循环伏安法（CV）用于研究Au（111）电极上11-巯基-1-十一烷醇（MUO）涂层的相演化。研究了包括HClO4和H2SO4在内的各种电解质对吸附行为的影响。发现MUO吸附主要在两种电解质中的Au（111）重建结构的人字形行的交叉角处开始。吸附簇的以下生长首先沿着人字形结构的面心立方（fcc）位置发展。在HClO4溶液中，当MUO的剂量浓度低时，MUO分子首先以平躺的方向吸附，生长到分子排列为（12 x根3）的有序结构的条纹结构域（β相）。当表面覆盖率变高时，MUO的碳氢化合物链会从Au（111）平面剥离，形成更稠密和饱和的D相，称为（根3 x根3）R30度。然而，在高剂量的MUO浓度下，不会出现条纹相。由于在高剂量浓度下硫醇基团的快速吸附，抑制了烃链-金相互作用，因此不能获得MUO分子的平坦取向。在H2SO4溶液中，即使在低剂量浓度下也不会形成条带状相，而是phi相直接出现在低覆盖率阶段。对于两种电解质观察到的不同现象归因于阴离子离子与金表面的不同相互作用。已经表明，硫酸根离子比高氯酸根离子在金表面上的吸附更强。认为在双电层中强烈吸附的硫酸根离子可抵抗烃链与金表面的直接接触，这也可防止形成平坦的取向。

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