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首页> 美国政府科技报告 >Probing Redox-Induced Molecular Transformations by Atomic-Resolution ScanningTunneling Microscopy: Iodide Adsorption and Electrooxidation on Au(111) in Aqueous Solution
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Probing Redox-Induced Molecular Transformations by Atomic-Resolution ScanningTunneling Microscopy: Iodide Adsorption and Electrooxidation on Au(111) in Aqueous Solution

机译：原子分辨率扫描隧道显微镜检测氧化还原诱导的分子转化：水溶液中au（111）上碘的吸附和电氧化

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In-situ atomic-resolution scanning tunneling microscopy (STM) has been utilizedon ordered Au(lll) under electrode potential control in acidic aqueous solution to examine iodine adlayer structures formed by iodide electrooxidation as well as electrosorption. In the potential region, -0. 3 to 0. 4 V vs SCE, below where electrooxidation of solution iodide occurs, several distinct iodine adlayer structures were observed. At the most negative potentials, structures close to the hexagonal ((check)3 x (check)3) R30 deg (Theta = 0.33) pattern are evident. The registry between the adlayer and the substrate lattice was deduced in part from composite domain images created by stepping the electrode potential so to alter markedly the adsorbate coverage during acquisition of a given STM image. At potentials between -0.2 and 0.2 V, adlayer patterns closer to the (5 x (check)3) (Theta = 0.4) structure became increasingly prevalent. This features a diminution in the iodine spacing along two of the three iodine rows, with a corresponding ca 5 deg shift from the R30 deg direction. Above 0.2 V, the STM images indicated the predominant presence of a more complex higher-coverage adlayer (Theta = 0.44) featuring long-range (19+/-lA) Z corrugations rotated by 8-10 deg from the hexagonal iodine adlattice. These corrugations arise from periodic alterations in the iodine binding site, necessitated by I-I distances that approach the van der Waals diameter. Above 0.3 V, however, poly-iodide chains were also observed,

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