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Fabrication of Self-assembled Film of Silicon Atomic Thin Wires and Its Applications for Optical Devices

硅原子细线自组装薄膜的制备及其在光学器件中的应用

基本信息

批准号：
12450128
负责人：
TAKAHAGI Takayuki
金额：
$ 9.15万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

The Si atoms in oligosilane molecular chain bond with two another atoms by σ-electrons like an atomic thin wire. The electrons delocalize in the state of σ-hyper-conjugation and differ from the σ-electron in usual organic compounds. Then, the oligosilane is expected to have rare optical and electrical properties. The degree of σ-hyper-conjugation is considered to depend on conformation of the main molecular chain. In this work, the self-assembled film of oligosilane was formed on the surface of the substrate. The optical and other properties of the film were measured and compared with those of solution and thin film made by the spin court method. As a result, the self-assembled film was confirmed to have the absorption peak assigned to σ-σ^* transition about 330-350 nm in UV/visible light spectrum shifting to the longer wave-length side than solution phase and the spin court film. By the quantum chemistry calculation method, we obtained the result that the HOMO-LUMO energy gap of the t … More wisted gauche-conformer has larger than trans-conformer. As the result, oligosilane molecules in the self-assembled film fixed to the surface of the substrate have the straight trans-conformer with extending a -hyper-conjugation, while oligosilane molecules in the solution and the spin court film have the twisted gauche-conformer with limited a -hyper-conjugation. The result suggests that the preparation of self-assembled film is one of effective methods to control of optical and the electrical properties of oligosilane. We obtained significant information for fabricating optical devices like as EL device. The self-assembled film of the alkylthiol molecules was formed further as a basic research for the fabrication of self-assembled film of chain molecules, and the electronic device as its application was researched. We confirmed that the self-assembled film could work as a tunnel barrier film. We observed quantum electric conduction phenomenon at room temperature in the gold nano-particles with self-assembled film on those surfaces. Less

低聚硅烷分子链中的硅原子通过σ-电子与另外两个原子成键，形成原子细线。这些电子在σ-超共轭状态下离域，与一般有机化合物中的σ-电子不同。因此，期望低聚硅烷具有罕见的光学和电学性质。σ-超共轭的程度被认为取决于分子主链的构象。在本工作中，低聚硅烷的自组装膜形成在基板的表面上。测量了薄膜的光学和其它性能，并与溶液和旋涂法制备的薄膜进行了比较。结果，证实自组装膜具有在UV/可见光光谱中约330-350 nm处归属于σ-σ^* 跃迁的吸收峰，该吸收峰比溶液相和自旋法院膜向更长波长侧移动。通过量子化学计算方法，得到了该体系的HOMO-LUMO能隙为： ...更多信息 Wisted gauche构象比trans-conformer大。结果表明，固定在基底表面的自组装膜中的低聚硅烷分子具有延伸的α-超共轭的直的反式构象，而溶液和自旋法院膜中的低聚硅烷分子具有有限的α-超共轭的扭曲的gauche构象.结果表明，自组装膜的制备是控制低聚硅烷光电性能的有效方法之一。为电致发光等光学器件的制作提供了重要的信息。进一步形成了烷基硫醇分子的自组装膜，为链状分子自组装膜的制备做了基础研究，并对其在电子器件中的应用进行了研究。我们证实了自组装膜可以作为隧道阻挡膜。我们在金纳米粒子表面自组装膜中观察到了室温下的量子导电现象。少