Construction of Super-Structured Spin-Polarized Donor having Spin-rectifying Property

具有自旋校正特性的超结构自旋偏振施主的构建

• 批准号: 13304056
• 负责人: SUGAWARA Tadashi
• 金额: $ 28.2万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13304056/
• 关键词: Spin-Polarized Donor; Organic Ferromagnetic Metal; Organic Field Effect Transistor; Magneto-Resistance; Nano Particle; Molecular Wire; Molecular Wire Network; Molecular Magnetism; スピン整流; 磁性; 導電性; 超分子; 分子素子; 磁性金属; 多重項; 量子効果

The ultimate goal of this project is to construct super-structured "spin-polarized donors" that operate as molecule-based spin-rectifying devices. The following findings along this line have been achieved during the project period.1.In order to improve the conductivity of its ionradical salt of benzo-annulated OF based spin-polarized donors, sulfur atoms of the donor moiety were replaced with selenium atoms. The ionradical salts and the charge-transfer complexes of these spin-polarized donors were also prepared. Among them, an ion-radical salt of a selenium-introduced spin-polarized donor (ESBN) turned out to behave as the low band-gap (Ea = 40 meV) semiconductor, which exhibited the possibility to show the metallic conductivity under a high pressure. Such ion-radical salts are expected to manifest spin-alignment through the spin-polarized conduction electrons on the basis of the double exchange mechanism.2.A novel TTF based donor, OdTBN, having long alkyl chains was prepared to increa … More se the feasibility of fabrication. A thin film composed of OdTBN was formed on a silicon wafer and it was found that the sample acted as a field-effect transistor (FET).3.The preparative method of Roll nano-particles chemisorbed by organic π-radical has been established. The nano-particles, with an average diameter of 4nm, were chemisorbed by ca. 100 molecules of a thiol-derivatized spin-polarized donor, which was generated by the reduction cleavage of the corresponding disulfide precursor. The extreme broadening of ESR line-shape suggests the presence of the exchange interaction between localized spins of chemisorbed radicals and conduction electrons in the gold nano-particle. Moreover, it was to be noted that the evaluation technique of the precise size and its distribution of gold nano-particles by means of an X-ray small-angle-scattering method was established in collaboration with Rigaku-Denki Corporation.4.Various molecular wires bearing thiol groups at both ends were synthesized and it was found that they constructed network-like structures with gold nano-particles on interdigitated gold electrodes. The conducting property of the networked gold nano-particles strongly depended on the size of the nano-particles and the structure and the length of molecular wires. The conductivity of the networked structures was measured under the application of an external magnetic field and it was found that some of the samples exhibited a magneto-resistance effect. Less

该项目的最终目标是构建超结构的“自旋极化供体”，作为基于分子的自旋校正器件。在项目期间，我们取得了以下成果： 1.为了改进苯并环化 OF 基自旋极化供体的离子自由基盐的电导率，供体部分的硫原子被硒原子取代。这些离子自由基盐和电荷转移络合物。还制备了自旋极化供体，其中，硒引入的自旋极化供体（ESBN）的离子自由基盐被证明具有低带隙（Ea = 40 meV）半导体的作用，这提供了可能性。以显示高压下的金属电导率，这种离子自由基盐有望通过基于双交换机制的自旋极化传导电子表现出自旋排列。制备了具有长烷基链的 TTF 供体 OdTBN，以提高制造的可行性。在硅晶片上形成由 OdTBN 组成的薄膜，结果发现该样品充当场效应晶体管 (FET)。 ).3.建立了有机π自由基化学吸附Roll纳米粒子的制备方法，采用化学吸附法制备平均直径为4nm的纳米粒子。大约 100 个硫醇衍生的自旋极化供体分子，它是由相应的二硫化物前体的还原裂解产生的。ESR 线形的极度加宽表明化学吸附自由基的局部自旋与传导之间存在交换相互作用。此外，值得注意的是，通过X射线来评估金纳米颗粒的精确尺寸及其分布。与Rigaku-Denki Corporation合作建立了小角散射方法。4.合成了各种两端带有硫醇基团的分子线，发现它们在叉指金电极上构建了金纳米粒子的网络状结构。网络状金纳米颗粒的性质很大程度上取决于纳米颗粒的尺寸和导电结构以及分子线的长度。在应用下测量了网络结构的电导率。外部磁场，发现一些样品表现出较小的磁阻效应。

项目成果

谷口伸一, 菅原正, ほか3名: "Noncatalytic, solvent-free thermal formation of cyclic trimers using 1,6-bis (acyloxylmethyl)haxa-2,4-diene derivatives"Tetrahedron Letters. 45. 2671-2675 (2004)

Shinichi Taniguchi、Tadashi Sukawara 和其他 3 人：“使用 1,6-双（酰氧基甲基）haxa-2,4-二烯衍生物非催化、无溶剂热形成环状三聚体”Tetrahedron Letters 45. 2671-2675 (2004)。

谷口伸一, 松下未知雄, 菅原正: "π型分子ワイヤーで連結した金ナノ粒子ネットワークの構造と電子輸送"ナノ学会会報. 2. 55-62 (2004)

Shinichi Taniguchi、Michio Matsushita、Tadashi Sukawara：“由 π 型分子线连接的金纳米颗粒网络的结构和电子传输”日本纳米学会公告 2. 55-62 (2004)。

Takasu, Isao, Izuoka, Akira, Sugawara, Tadashi: "Observation of Quantum Paraelectricity in an Intermolecular Ionic Hydrogen-Bonded Crystal of a Squaric Acid Derivative."Journal of Physical Chemistry B. 108. 5527-5531 (2004)

Takasu、Isao、Izuoka、Akira、Sukawara、Tadashi：“方酸衍生物分子间离子氢键晶体中量子顺电性的观察。”物理化学杂志 B. 108. 5527-5531 (2004)

Matsushita, Michio, Sugawara, Tadashi et al.: "Formation of self-assembled monolayer of phenylthiol carrying nitronyl nitroxide on gold surface."Chemistry Letters. 2002. 596-597 (2002)

Matsushita、Michio、Sugara、Tadashi 等人：“在金表面形成携带硝基氮氧化物的苯硫醇自组装单层。”化学快报。

Nakazaki, Jotaro, Sugawama, Tadashi et al.: "Design of spin-polarized molecular wire as a prototypal unimolecufar quantum spin device."Internet Electronic Journal of Molecular Design. 2. 112-127 (2003)

Nakazaki、Jotaro、Sukawama、Tadashi 等人：“作为原型单分子量子自旋器件的自旋极化分子线的设计。”分子设计的互联网电子杂志。