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Molecular Assemblies on Silicon via Silicon-Carbon Covalent Bonds

通过硅碳共价键在硅上进行分子组装

基本信息

批准号：
15310096
负责人：
TADA Hirokazu
金额：
$ 10.05万
依托单位：
Osaka University (2005)Institute for Molecular Science (2004)Okazaki National Research Institutes (2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Much attention is being denoted to the study on molecular-scale electronic devices. While the molecules having a S atom at the terminal are widely used to construct a two-terminal device with Au electrodes, the interface of Au-S has not been well characterized. Instead of the Au-S system, molecules covalently bound to silicon are thought to be a potential candidate to provide a stable interface for carrier injection into molecules. The advantages of the molecules/semiconductor system are as follows : (a) the interface is thermally and chemically stable, (b) the electric properties can be controlled by doping electron-donating or -withdrawing impurities, and (c) micro- and nano-fabrication techniques established in the field of semiconductor devices are applicable. We have prepared molecular assemblies on silicon via chemical reaction between molecules having double bonds at the terminal and hydrogen-terminated silicon and studied reaction mechanism and stability by attenuated total ref … More lectance infrared (ATR-IR) spectroscopy and atomic force microscopy (AFM). In this work, we have demonstrated the following results : (1) alkyl-chains on silicon have an all-trans conformation ; (2) monolayers prepared in diluted 1-alkene were identical with that prepared in neat 1-alkene ; and (3) the rate of reaction between 1-alkene and hydrogen-terminated silicon remarkably depended on the concentration of 1-alkene. We have prepared a monolayer of dye molecules on silicon through anchoring molecules. The intensity of luminescence from the molecules on silicon was found to be strongly affected by the impurity concentration of silicon wafers used. We have also demonstrated that the silicon AFM cantilevers covered with organic molecules are available for friction-force microscopy and non-contact AFM in air as well as in ultrahigh vacuum. It has been shown that the cantilevers covered with organic monolayers via covalent bonds are useful for chemical force microscopy with contact and non-contact modes AFM in various atmospheres since the interface between molecules and cantilevers is thermally and chemically stable. Less

分子尺度电子器件的研究受到了极大的关注。虽然末端含有S原子的分子被广泛用于构建金电极的两端器件，但金-S界面的性质还没有得到很好的表征。与Au-S体系不同，共价键合在硅上的分子被认为是为载流子注入分子提供稳定界面的潜在候选者。分子/半导体系统的优点是：(A)界面在热和化学上是稳定的，(B)可以通过掺杂给电子或引出杂质来控制电学性质，以及(C)在半导体器件领域建立的微和纳米制造技术是适用的。通过末端具有双键的分子与氢端的硅发生化学反应，在硅表面制备了分子组装，并用衰减全参比…研究了反应机理和稳定性多选红外光谱(ATR-IR)和原子力显微镜(AFM)。在这项工作中，我们证明了以下结果：(1)硅上的烷基链具有全反式构象；(2)在稀释的1-烯烃中制备的单分子膜与在纯1-烯烃中制备的单分子膜相同；(3)1-烯烃与氢端基硅之间的反应速度显著依赖于1-烯烃的浓度。我们通过锚定分子在硅表面制备了染料分子单分子膜。研究发现，硅片上分子的发光强度受硅片杂质浓度的影响很大。我们还证明了有机分子覆盖的硅原子力显微镜悬臂梁可用于摩擦力显微镜和空气中以及超高真空中的非接触式原子力显微镜。研究表明，由于分子与悬臂梁之间的界面在热和化学上是稳定的，因此通过共价键覆盖有机单分子膜的悬臂梁在不同的大气中都适用于接触式和非接触式原子力显微镜的化学力显微镜。较少