2006 Fiscal Year Final Research Report Summary
Construction of photo-functional molecular assembly and application for materials to control interfacial properties.
| Project/Area Number |
14050026
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
|
| Allocation Type | Single-year Grants |
|---|
| Review Section |
Science and Engineering
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
SEGAWA Hiroshi The University of Tokyo, Research Center for Advanced Science and Technology, Professor (50216511)
|
|---|
| Project Period (FY) |
2001 – 2006
|
| Keywords | Photo-function / Molecular assembly / Porphyrin / J-aggregates / Spin alignment / Solar cell / Nano-structure / Intermolecular interaction |
|---|
| Research Abstract |
Studies on photo-functional interfaces are very important for the progress of photo-energy conversion and photocatalysts, and for the creation of novel functional materials. At the interfaces, which are formed between different materials, nanometer-scale structural control plays important roles for the appearance of physical properties and functionalities. In this study, molecular systems with ordered nano-structures were investigated as a material to control interfacial properties. In order to apply them as devices by constructing novel molecular assemblies which exhibit photo-functions and electronic functions, following studies were performed : (1) design of exciton-controlling materials by controlling nano-structures of porphyrin J-aggregates, (2) spin alignment of π-radicals of porphyrin arrays on the basis of nano-structural controlling, (3) formation of J-aggregates at the surface of titania and development of materials with electronic spin-functions derived from interfacial ele
… More
ctron transfer, and (4) development of energy-storable dye-sensitized solar-cells. In this study, it was found that protonated water-insoluble porphyrin derivatives are self-assembled at interface to form J-aggregates, and their association structure and excitonic interaction could be changed variously. It is large progress that efficient excitation energy transfer was observed at hetero-layered nano-sheets of porphyrin J-aggregates, which were developed in this study. On the other hand, multiplet spin states were achieved in this study by generating the π-radicals of directly-linked porphyrin arrays, indicating that spin-spin interactions can be modified by controlling the nano-structures. The result is important for molecular magnetism or development of magnetic functional materials. Furthermore, we have developed the fundamental structure of energy-storable dye-sensitized solar-cell, which is important breakthrough to achieve stable outputs and low costs, and is expected to contribute the propagation of solar-cells. Less
|
