Polysilane Bearing “Sulfide Tripod” Terminus: Preparation and Selective Chemisorption on Gold Surface
Polysilane Bearing “Sulfide Tripod” Terminus: Preparation and Selective Chemisorption on Gold Surface
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带有聚硅烷的“硫化物三脚架”末端：金表面的制备和选择性化学吸附
DOI：
10.1021/ma0212036
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发表时间：
2003
期刊：
影响因子：
5.5
通讯作者：
K. Torimitsu
中科院分区：
文献类型：
--
作者：
K. Furukawa;K. Ebata;H. Nakashima;Y. Kashimura;K. Torimitsu
近几十年来，聚合物表面接枝改性的研究在实验和理论上都引起了广泛的关注。1在高接枝密度状态下的接枝聚合物通常被称为聚合物刷，并且为了例如表面改性的目的而被充分研究。另一方面，在低密度状态下的接枝聚合物可用于在单分子水平上观察聚合物的结构和性能。我们已经提出了用于固定单个聚合物链单独在固体表面上的末端接枝技术，并已证明了这种技术使用聚硅烷的有用性。2.我们成功地用我们的接枝聚硅烷样品观察了聚硅烷分子的各种单分子和超分子结构。3聚硅烷具有基于σ-共轭的半导体性质4，并表现出空穴迁移率5和电致发光等特征。因此，通过使用单个聚硅烷分子观察这些物理性质也将是非常有意义的。7我们成功地在固体表面上合成了带有羟基（-OH）和氢化硅基（Si-H）的端接聚硅烷。本论文的目的是在金属表面合成端接聚硅烷。增加表面的多样性是接枝聚合物研究的重要内容。这对于研究聚硅烷的功能聚合物与导电金属表面之间的电子相互作用也将是重要的。我们选择金作为金属，因为金和硫醇之间的化学吸附已经被广泛研究，并且对于将分子结合到金表面是有用的。金表面自组装单分子层（SAM）是最重要的体系之一。8化学吸附也是相当有选择性的9，因此已经提出并证明了金-硫醇键和羧酸铟锡氧化物键的一锅合成。9a
Research on surface-grafted polymer has been drawing much attention both experimentally and theoretically for a couple of decades. 1 The grafted polymer in a high grafting density regime is often called polymer brush and well studied for the purpose of, for instance, surface modification. On the other hand, the grafted polymer in a low density regime is useful for observing structures and properties of the polymers at the single molecule level. We have proposed the end-graft technique for fixing single polymer chains individually on a solid surface and have demonstrated the usefulness of this technique using polysilanes. 2 We successfully visualized a variety of single molecular and supramolecular structures of polysilane molecules by using our endgrafted polysilane samples. 3 Polysilanes have a semiconducting nature based on the σ-conjugation4 and exhibit such features as hole mobility5 and electroluminescence. 6 Thus, the observation of those physical properties by using the single polysilane molecule would be also of great interest. 7We have achieved the syntheses of end-grafted polysilanes on solid surfaces with the hydroxyl (-OH) and hydrosilyl (Si-H) groups. Our aim in this paper is to synthesize end-grafted polysilane on metal surface. Increasing the variety of surfaces is important for research on grafted polymer. It would be also important for studying electronic interactions between such functional polymers of polysilane and the conductive metal surface. We chose gold as the metal, because chemisorption between gold and thiol has been extensively studied and is useful for bonding molecules to the gold surface. A self-assembled monolayer (SAM) on a gold surface is one of the most important systems. 8 The chemisorption is also quite selective9 so that the onepot synthesis of a gold-thiol bond and a carboxyl acidindium tin oxide bond has been proposed and demonstrated. 9a