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Molecular-scale noncontact atomic force microscopy contrasts in topography and energy dissipation on c(4x2) superlattice structures of alkanethiol self-assembled monolayers

机译:分子尺度非接触原子力显微镜在链烷硫醇自组装单层c(4x2)超晶格结构上的形貌和能量耗散方面形成对比

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摘要

Alkanethiol self-assembledmonolayers formed on Au(111) surfaces were investigated by noncontact atomic force microscopy (NC-AFM). Dodecanethiol monolayers prepared at 78 °C were imaged by NC-AFM, which revealed that the film is composed predominantly of two different phases of c(4×2)superlattice structures. The obtained molecular-scale NC-AFM contrasts are discussed in comparison with previously reported scanning tunneling microscopy images. We found that the energy dissipation image exhibits a clear difference in its molecular-scale contrast between the two phases. Possible origins of the difference are discussed in relation to the fluctuation and/or stability of the packing structures.
机译:通过非接触原子力显微镜(NC-AFM)研究了在Au(111)表面上形成的烷硫醇自组装单分子膜。通过NC-AFM对在78°C下制备的十二烷硫醇单层成像,表明该膜主要由c(4×2)超晶格结构的两个不同相组成。与先前报道的扫描隧道显微镜图像比较,讨论了获得的分子级NC-AFM对比。我们发现能量耗散图像在两相之间的分子尺度对比度上表现出明显的差异。关于填充结构的波动和/或稳定性,讨论了差异的可能来源。

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