STM Study of Molecule Double-Rows in Mixed Self-Assembled Monolayers of Alkanethiols

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• 作者：Gengzhao Xu ; D. Phillip Woodruff ; Neil Bennett ; Martin Elliott ; J. Emyr Macdonald
• 刊名：Langmuir
• 出版年：2010
• 出版时间：June 1, 2010
• 年：2010
• 卷：26
• 期：11
• 页码：8174-8179
• 全文大小：882K
• 年卷期：v.26,no.11(June 1, 2010)
• ISSN：1520-5827

文摘

Using scanning tunnelling microscopy (STM), we have studied mixed self-assembled monolayers of linear alkanethiol molecules. Nonanedithiol (C9S2), nonanethiol (C9S), decanethiol (C10S), and dodecanethiol (C12S) were inserted into a self-assembled octanethiol (C8S) host matrix monolayer on an Au(111) surface using a two-step method. Quasi-one-dimensional double-row structures were found in the ordered, close-packed domains of the C8S matrix for each mixed monolayer system. These close-packed domains coexist with ordered striped phase domains (for C9S and C10S) or with a disordered phase (for C9S2 and C12S). Results from high-resolution images suggest that the double-rows are composed of inserted non-nearest-neighbor substitutional molecules, the ordering of which may be a result of locally induced surface stress.