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首页> 外文期刊>Applied Surface Science >Functional group selective STM Imaging in self-assembled monolayers: Benzeneselenol on Au(111)
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Functional group selective STM Imaging in self-assembled monolayers: Benzeneselenol on Au(111)

机译：自组装单层中的官能团选择性STM成像：Au（111）上的苯甲烯醇

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摘要

Benzeneselenol (PSe) self-assembled monolayers (SAMs) formed on Au(111) substrate by the immersion procedure with an immersion time of 24 h and 4 weeks were studied by high-resolution scanning tunneling microscopy (STM). The short molecular rows, which have been previously attributed to irregular translational domains, were found to be regularly repeated within a single domain in the SAMs fabricated upon the immersion for 4 weeks, forming adlayer structure with a very large unit cell. This structure could be assigned as a (27 x 5) superlattice (alpha phase) containing 36 molecules in the oblique unit cell. This phase coexisted with a different phase having a commensurate (8 root 3 x 4) superstructure (beta phase) containing 28 protrusions per rectangular unit cell. Analysis of the STM images suggested that each PSe molecule in the beta phase was imaged not as one but as a pair of protrusions, which were attributed to the benzene ring and the selenium headgroup of the PSe molecule. At the given molecular length, the spacing between the protrusions defined the molecular tilt, allowing us to derive the orientation of the SAM constituents directly from the STM image. (C) 2017 Elsevier B.V. All rights reserved.
机译：通过高分辨率扫描隧道显微镜（STM）研究了在Au（111）衬底上通过浸没程序，浸没时间为24 h和4周的苯并硒醇（PSe）自组装单分子膜（SAMs）。发现先前归因于不规则翻译结构域的短分子行在浸没4周后制成的SAM中的单个结构域内规则重复，形成具有非常大的晶胞的附加结构。该结构可以指定为在斜晶胞中包含36个分子的（27 x 5）超晶格（α相）。该相与具有相称的（8根3 x 4）超结构（β相）的不同相共存（每个矩形晶胞包含28个突起）。 STM图像分析表明，β相中的每个PSe分子均不是成对成像，而是成对出现，这归因于PSe分子的苯环和硒头基。在给定的分子长度下，突起之间的间距定义了分子倾斜，这使我们可以直接从STM图像中得出SAM成分的方向。 （C）2017 Elsevier B.V.保留所有权利。

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