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Study of Melocular and Biomolecular Devices Working with Scanning Probe Microscpes

使用扫描探针显微镜进行分子和生物分子装置的研究

基本信息

批准号：
06403020
负责人：
FUJIHIRA Masamichi
金额：
$ 23.55万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06403020/
关键词：
Molecular Devices Biomolecular Devices Langmuir-Blodgett Films Scanning Probe Microscope Atomic Force Microscope Scanning Surface Potential Microscope Scanning Near-field Optical Microscope Scanning Tunneling Microscope 分子フォトダイオード走査近視野光

项目摘要

Recently, we have succeeded in developing highly efficient molecular photodiodes as a molecular device for photo-electric conversion. The basic idea is that we try to develop artificial photo-electric conversion molecular devices by mimicking the charge separation mechanism and structural function of the reaction center in natural photosynthesis. However, so far the size of our molecular devices were in the order of mm to cm in x-y dimension in spite of their size of thickness of the order of nm.Namely, our devices functioned as molecular devices in terms of structure and function, but the size of the devices were still in macro scale and the developed devices were far from what is called "truly molecular scale devices".In the present research project, we tried to develop true molecular photodiodes not only in their function but also in their size. By the efforts to realize this final goal, we succeeded in getting the following results.1)Fabrication of molecular photodiodes by using an atomic force microscope(AFM)as a mechanical Processing machine in nm scale.2)The use of a scanning tunneling microscope(STM)and a scanning surface potential microscope(SSPM)as tools for connecting molecular devices to their external electronic circuits.3)Attainment of much higher efficiencies of the molecular photodiodes by designing new types of molecules and structure of the devices.In connection with the term 2), we also succeeded in developing novel scanning near-field optical microscope.(SNOM)in which tip-sample separation is controlled by non contact mode AFM.This device was used to connect the molecular photodiode optically from the external optical circuit.In connection with the term 3), further increase in efficiency of photo-induced charge separation by addition of a second electron donor(D')monolayr on the A-S-D monolayr and optimization of energy transfer between the S moiety and H Antenna molecules in a mixed A-S-D and H monolayr system were established.

最近，我们成功开发了高效分子光电二极管作为光电转换的分子器件。其基本思想是通过模仿自然光合作用中反应中心的电荷分离机制和结构功能，尝试开发人工光电转换分子器件。然而，到目前为止，我们的分子器件的尺寸在x-y维度上处于毫米到厘米的量级，尽管它们的厚度尺寸为纳米量级。也就是说，我们的器件在结构和功能上起到了分子器件的作用，但器件的尺寸仍然处于宏观尺度，所开发的器件距离所谓的“真正的分子尺度器件”还很远。在目前的研究项目中，我们试图开发真正的分子光电二极管，而不是不仅在于它们的功能，还在于它们的尺寸。通过努力实现这一最终目标，我们成功获得了以下成果。1）使用原子力显微镜（AFM）作为纳米级机械加工机器制造分子光电二极管。2）使用扫描隧道显微镜（STM）和扫描表面电势显微镜（SSPM）作为将分子器件连接到外部电子电路的工具。3）实现更高的通过设计新型分子和器件结构，提高了分子光电二极管的效率。与第2)项相关，我们还成功开发了新型扫描近场光学显微镜(SNOM)，其中尖端与样品的分离由非接触模式AFM控制。该器件用于从外部光路以光学方式连接分子光电二极管。与第3)项相关，进一步提高了分子光电二极管的效率。通过在 A-S-D 单层上添加第二电子供体 (D') 单层来实现光诱导电荷分离，并优化混合 A-S-D 和 H 单层系统中 S 部分和 H 天线分子之间的能量转移。