Devices on molecular and DNA levels

电子和光子学功能分子的性质以及DNA、蛋白质等生物超分子的性质作为大量分子的平均性质，已经被研究了很长时间。最近开始使用光谱方法或各种扫描探针显微镜来研究单个分子。在这项研究中，分子和DNA水平上的各种器件将通过实验探索单分子的新的电子、光学、化学和机械功能，ii)这些新功能在各种单分子器件中的应用，iii)开发用于器件的纳米结构的新工艺和制造方法，iv)表征纳米结构和测量器件特性，v)使器件特性合理化，并从理论上预测未知的器件特性。通过五年的计划，上述几乎所有的目的都在…中描述更多的本研究是在团队成员之间强有力的合作研究活动下实现的。项目期间取得的成果报告了102篇原创论文、综述文章和书籍章节，其中有31篇具有代表性的原创论文。特别是，以下是该项目的突出成果。1)新合成的球形碳氢化合物(BCO)硫醇衍生物在Au(111)表面的自组装单分子膜(SAM)基质中单功能分子的分离，并用扫描隧道显微镜(SPM)观察其行为；ii)发现烷基(或二硫醇)烷基(或亚烷基)链上构象变化(反式为Guche)对其单分子电导的影响及其理论解释，iii)详细研究结合方式对单分子电导的影响，Iv)使用非接触式AFM在原子或分子分辨率下观察混合SAM中的端基，v)制作用于单分子器件的平面纳米间隙电极，vi)单分子结中量子环电流的预测，以及vii)分子桥中载流子转移的电子-振动耦合的理论研究。较少

Properties of functional molecules for electronics and photonics and those of biological supramolecules such as DNA and proteins have been studied for a long time as their average properties of a large number of molecules. The study of an isolated single molecule has recently begun by the use of spectroscopic methods or various scanning probe microscopes.In this study, a variety of devices on molecular and DNA levels will be pursued by i) exploring novel electronic, optic, chemical, and mechanical functions of single molecules experimentally, ii) envisaging application of such novel functions to various single molecular devices, iii) developing new processes and fabrication methods of nanostructures for the devices, iv) characterizing the nanostructures and measuring device characteristics, and v) rationalizing the device characteristics and in addition predicting unknown device characteristics theoretically.Through the five years projects, almost all of the above-described purposes in … More the present study have been realized under the strong cooperative research activities among the team members. The results obtained during the projects have been reported as 102 of original papers, review articles, and book chapters including 31 representative original papers. In particular, the followings are prominent achievements of the project. i) isolation of single functional molecules in matrices of a self-assembled monolayer (SAM) of a newly synthesized spherical hydrocarbon (BCO) thiol derivative on Au(111) and observation of their behavior with a scanning tunneling microscope (SPM), ii) discovery of effect of conformational change (trans to gauche) in an alkyl (or alkylene) chain of alkane thiol (or dithiol) on their single molecular conductance and the theoretical interpretation, iii) detailed researches on the effect of binding modes on single molecular conductance, iv) observation of terminal groups at atomic or molecular resolution in a mixed SAM using a non-contact AFM modified with a tip with a CaF_2 nano-crystal, v) fabrication of planer nano-gap electrodes for single molecular devices, vi) prediction of quantum loop current in a single molecular junction, and vii) theoretical study of electron-vibration coupling on carrier transfer in molecular bridges. Less