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Fabrication of Metallic Architectures for precise control of energy conversion

制造金属结构以精确控制能量转换

基本信息

批准号：
16205026
负责人：
MURAKOSHI Kei
金额：
$ 32.36万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

项目摘要

In this project, we have fabricated structurally well-defined metallic nano-architectures that are capable of energy conversion among thermal, photon, kinetic, and electro-chemical energies. Especially, we have concentrated three subjects below. First is a controlling of an electron conduction process in a metal atomic wire. In the atomic wire connected by a single atom junction, electron conduction characteristics can be controlled by external electro-chemical energy. We have succeeded in controlling of energy-and spin-selective electron conduction based on the electro-chemical potential at both electrode of the junction. Additionally, an in-situ measurement of vibrational spectrum has clarified the insertion process of a small molecule in the junction. Second is a conversion of photon energy to molecular vibration energy. To realize an effective conversion, we focused locally enhanced electric field around metal nano-architecture. Electrons in the architecture collectively oscillate by a light-irradiation with resonant energy. This causes highly enhanced electric field around the architecture. By measuring a Raman scattering signal from a single molecule situating at a close proximity of the architecture, we have found that the scattering cross-section was increased by the order of 10^10 compared with normal Raman process. Third is a controlling a molecular diffusion energy by using of metallic architecture. Two-dimensional array of metallic nano-architecture has demonstrated rectification ability concerning a collective flow of a molecular assembly. These research results in the present project will offers new molecular/electron manipulation, rectification, and detection systems in a future nano-devices.

在这个项目中，我们制造了结构明确的金属纳米结构，能够在热能、光子能、动能和电化学能之间进行能量转换。特别是，我们集中了以下三个主题。首先是控制金属原子线中的电子传导过程。在由单原子结连接的原子线中，电子传导特性可以通过外部电化学能量来控制。我们成功地基于结两个电极的电化学势来控制能量和自旋选择性电子传导。此外，振动谱的原位测量阐明了小分子在连接处的插入过程。其次是将光子能量转换为分子振动能量。为了实现有效的转换，我们集中在金属纳米结构周围局部增强电场。结构中的电子通过具有共振能量的光照射而集体振荡。这会导致架构周围的电场高度增强。通过测量位于结构附近的单个分子的拉曼散射信号，我们发现与正常拉曼过程相比，散射截面增加了 10^10 量级。第三是通过使用金属结构来控制分子扩散能。金属纳米结构的二维阵列已表现出对分子组装的集体流动的整流能力。本项目中的这些研究成果将为未来的纳米器件提供新的分子/电子操纵、整流和检测系统。