INVESTIGATION ON ANALYSIS OF NANO-DIELECTRIC AND ELECTRONIC INTERFACIAL PHENOMENA IN ORGANIC MOLECULAR FILM BY MAXWELL-DISPLACEMENT-CURRENT MEASUREMENT AND FABRICATION OF CONFORMATIONAL MOLECULAR MEMORY

麦克斯韦位移电流测量分析有机分子薄膜中纳米电介质和电子界面现象及构象分子存储器的制作

• 批准号: 09450122
• 负责人: IWAMOTO Mitsumasa
• 金额: $ 6.85万
• 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 (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450122/
• 关键词: Maxwell-displacement-current; azobenzene; Phase transition; Organic monolayer; Electro Static Phenomena; Spatial charge Distribution; Electronic Density of State; polyimide

The purpose of this investigation was to clarify the dielectric and electronic properties of organic monolayer films, and applied them to conformational molecular memory. Thus, this investigation has been carried out on the basis of the idea of Maxwell-displacement current measurement proposed by the investigators. The investigators analyzed the molecular motion of organic monolayer films using a rod-like polar molecular model, assuming the motion of molecules is ruled by the Boltzmann statistics. They theoretically derived a dielectric constant of monolayers and also analyzed the phase transition of organic monolayers, taking into account the interaction working between polar molecules and water surface as well as the electric repulsive interaction working the constituent molecules. To clarify the interfacial electrostatic behavior of organic films, the investigators also used the Kelvin-Probe method and developed a method for determining the electrostatic space charge distribution at … More the molecular-film/electrode interface, as well as for determining the Distribution of the Electronic Density of States.Orientational transition process of LCs triggered by conformational change of azobenzene and the molecular motion of azobenzenes in mixed monolayer systems were examined. The results were summarized as follows : (1) The physico-chemical properties of organic monolayers such as dielectric constant, relaxation time can be analyzed using a rod-like polar molecular model. (2) Phase transition of monolayers, such as Sa-Sc transition, can be analyzed using a rod-like polar molecular model. (3) The generalized formula of thermally stimulated current was obtained. (4) Spatial distribution at the metal/film interface and film/film interface can be determined on the order of nano-meter scale by using the relationship between the number of deposited organic molecular films and the surface potentials. Experiments ware performed for electrically insulating Polyimide LB films and semiconducting functionalized PI LB films and phthalocyanine films. (5) Distribution of the Electronic Density of states can be determined from the temperature dependence of the surface potentials. Organic films used in this study were polyimide and phthalocyanines. (6) Spatial charges exit at the interface depending on the kinds of metals and the organic molecules. (7) The I-V characteristic of molecular-film diodes was analyzed taking into account the interfacial phenomena. (8) The orientational transition process could be controlled by the cis-trans photoisomerization of surface azobenzene monolayers. The motion of LC molecules was analyzed based on a continum theory, and the motion of LCs could be examined by a simultaneous measurement of optical transmittance and the capacitance. Less

本研究的目的是阐明有机单层薄膜的介电和电子性质，并将其应用于构象分子记忆。因此，本研究是在研究人员提出的麦克斯韦位移电流测量思想的基础上进行的。研究人员使用棒状极性分子模型分析了有机单层膜的分子运动，假设分子的运动受玻尔兹曼统计量的支配。他们从理论上推导了单分子膜的介电常数，并分析了有机单分子膜的相变，考虑了极性分子与水面之间的相互作用以及组成分子之间的电排斥相互作用。为了阐明有机膜的界面静电行为，研究人员还使用了开尔文探针方法，并开发了一种确定分子-膜/电极界面上静电空间电荷分布以及确定电子态密度分布的方法。研究了偶氮苯构象变化引发LCs的取向转变过程和偶氮苯在混合单层体系中的分子运动。结果表明：(1)采用棒状极性分子模型分析了有机单层膜的介电常数、弛豫时间等理化性质。(2)单分子膜的相变，如Sa-Sc相变，可以用棒状极性分子模型来分析。(3)得到了热激电流的广义公式。(4)利用沉积有机分子膜数量与表面电位的关系，可以在纳米尺度上确定金属/膜界面和膜/膜界面的空间分布。对电绝缘聚酰亚胺LB膜、半导体功能化PI LB膜和酞菁膜进行了实验研究。(5)态的电子密度分布可以由表面电位的温度依赖性确定。本研究中使用的有机薄膜是聚酰亚胺和酞菁。(6)界面上存在空间电荷，这取决于金属和有机分子的种类。(7)考虑界面现象，分析了分子膜二极管的I-V特性。(8)表面偶氮苯单分子层的顺反光异构化可以控制取向转变过程。基于连续介质理论分析了LC分子的运动，并通过同时测量光透过率和电容来检测LC的运动。少

项目成果

C. X. Wu and M. Iwamoto: "The calculation of the dielectric constant of dielectric anisotropic monolayer films on a material surface"Phys. Rev.. B55. 10922-10926 (1997)

C. X. Wu 和 M. Iwamoto：“材料表面介电各向异性单层薄膜介电常数的计算”Phys。

C.X.Wu,Z.C.Ou-Yang and M.Iwamoto: "Polar orientational phase transition and differential dielectric constant of smectic monolayer films" J.Chem.Phys.109. 4552-4561 (1998)

C.X.Wu、Z.C.Ou-Yang 和 M.Iwamoto：“近晶单层薄膜的极性取向相变和微分介电常数”J.Chem.Phys.109。

Mitsumasa Iwamoto: "Maxwell Displacement Current across Monolayers and its Application to Monolayer-Film Devices" 5th International Conference on Properties and Application of Dielectric Materials. 07O01. 515-518 (1997)

Mitsumasa Iwamoto：“跨单层的麦克斯韦位移电流及其在单层薄膜器件中的应用”第五届介电材料性能与应用国际会议。

M.Iwamoto, A.Sugimura, and Z.C.Ou-Yag: "The behavior of the Maxwell displacement current for a biaxial model of monolayers at the liquid-air interface" Chem.Phys.Lett.274. 505-512 (1997)

M.Iwamoto、A.Sugimura 和 Z.C.Ou-Yag：“液-气界面处单层双轴模型的麦克斯韦位移电流的行为”Chem.Phys.Lett.274。

M.Iwamoto, C.X.Wu, and Z.C.Ou-Yang: "Separation of chiral phases by compression : kinetic localization of the enantiomers in a monolayer of racemic amphiphilies viewed as mixing cholesteric liquid crystals" Chem.Phys.Lett.285. 306-312 (1998)

M.Iwamoto、C.X.Wu 和 Z.C.Ou-Yang：“通过压缩分离手性相：对映异构体在单层外消旋两亲物中的动力学定位，被视为混合胆甾型液晶”Chem.Phys.Lett.285。