2007 Fiscal Year Final Research Report Summary
Fabrication of Metallic Architectures for precise control of energy conversion
| Project/Area Number |
16205026
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Inorganic industrial materials
|
|---|
| Research Institution | Hokkaido University |
|---|
Principal Investigator |
MURAKOSHI Kei Hokkaido University, Faculty of Science, Professor (40241301)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
木口 学 北海道大学, 大学院・理学研究院, 助教 (70313020)
並河 英紀 北海道大学, 大学院・理学研究院, 助教 (30372262)
|
|---|
| Project Period (FY) |
2004 – 2007
|
| Keywords | energy conversion / quantum conductance / asymmetric architecture / optical property / surface / interface property / nano-contact / carbon nanotube / molecular separation |
|---|
| Research Abstract |
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.
|
