Devices on molecular and DNA levels

电子和光子学功能分子的性质，以及DNA和蛋白质等生物超分子的性质，由于它们是大量分子的平均性质，一直受到人们的研究。对孤立的单分子的研究最近开始使用光谱方法或各种扫描探针显微镜。在本研究中，将通过i)通过实验探索单分子的新型电子、光学、化学和机械功能，ii)设想这些新功能在各种单分子器件中的应用，iii)开发用于这些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，来追求分子和DNA水平上的各种器件。v)对器件特性进行合理化，并对未知器件特性进行理论预测。通过5年的项目，在团队成员之间强有力的合作研究活动下，几乎实现了上述研究的所有目的。在项目中获得的成果报告为102篇原创论文、综述文章和书籍章节，其中代表性原创论文31篇。特别值得一提的是，项目取得了以下突出成果。1)在Au（111）上新合成的球形烃（BCO）硫醇衍生物的自组装单层（SAM）基质中分离出单个功能分子，并用扫描隧道显微镜（SPM）观察了它们的行为；2)发现烷基（或烷基烯）链烷烃硫醇（或二硫醇）的构象变化（反式到间旋式）对它们的单分子电导的影响及其理论解释。iii)结合模式对单分子电导影响的详细研究；iv)用尖端修饰CaF_2纳米晶体的非接触式原子力显微镜在原子或分子分辨率上观察混合SAM的末端基团；v)单分子器件的平面纳米间隙电极的制备；vi)单分子结量子环电流的预测；vii)分子桥中载流子转移的电子-振动耦合的理论研究。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