Search for Novel Carbon Based Nanonetwork Materials and their Properties

寻找新型碳基纳米网络材料及其性能

• 批准号: 11165218
• 负责人: IWASA Yoshihiro
• 金额: $ 28.1万
• 依托单位: Japan Advanced Institute of Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11165218/
• 关键词: fullerene; carbon nanotube; intercalation compounds; fullerene dimer; antiferromagnetism; molecular orbital ordering; dielectric response; カーボンナノチューブ; 計算機実験; 力学的性質; インターカレーション; ラマン散乱; 光物性

(1) Intercalation processes of carbon nanotubes with alkali metalsOne of the possible application of single walled carbon nanotubes (SWNT) is the anode of the Li ion batteries. We have uncovered the intercalation processes by means of the spectroscopic methods, such as Raman, infrared, and XPS. First, alkali metals are inserted into interstitial sites surrounded by three tubes, followed by an insertion into the smaller site between two tubes, causing a serious expansion of the intertube distances. Until this state, A3C80, the concentration of alkali metals increases continuously, but displays a discontinuous jump to A9C80, above which the A concentration shows a continuous increase again.(2) Molecular orientations and magnetic structures in fullerene antiferromagnetsWe have systematically synthesized (NH_3)A_3C_<60>, by intercalating neutral ammonia molecules into A_3C_<60> superconductors, and found that all the monoammoniated compounds are antiferromagnetic insulators. (NH_3)A_3C_<60 … More > adopts an orthorhombic unit cell derived by a slight deformation of the fcc cell of A_3C60, and because of this deformation, the electron is localized on the C_<60> moiety. Furthermore, the magnetic structure and molecular orientations have been determined by NMR, and neutron scattering experiments, respectively. The correlation between these displays a nice analogy to the relation between the orbital and spin orderings in transition metal oxides magnets, which is known as Kanamori-Goodenough rule.(3) Novel dimer structure in rare earth metal doped fulleridesIntercalation of fullerenes with rare earth metals has been investigated. Among these, we succeeded in synthesizing single phase Sm_3C_<70>, and in determining the crystal structure in a electron density level, by means of MEM/Rietveld analysis. It was found that two neighboring C_<70> moieties are connected by the Sm ion, forming a new type of dimer structure. This dimer structure is considerably stable, because the structure is maintained at least up to 850K, in contrast to the bond breaking in the conventional fullerene polymers showing a bond breaking below 600K.(4) Dielectric properties of La@C_<82> thin filmsWe have fabricated thin films of the metallofullerene La@C_<82>, and measured dielectric constants as a function of temperature. The dielectric constant at room temperature is about 40, approximately one order larger than that of C_<60> (4.4). The considerably large dielectric constant is presumably due to the rotation of the molecules with a large dielectric moment. Such dipolar activity of La@C_<82> might suggest that the molecular rotation states could be controlled by the external electic field. Less

（1）碳纳米管与单壁碳纳米管（SWNT）的碳纳米管与碱金属的插入过程是李离子电池的阳极。我们已经通过光谱方法（例如拉曼，红外和XP）揭示了插入过程。首先，将碱金属插入三个试管周围的间隙部位，然后将插入两根管之间的较小位点插入，从而严重地膨胀了Interchube距离。直到该状态为A3C80，碱金属的浓度一直持续增加，但不连续跳到A9C80，高于该A浓度再次显示出连续的增加。（2）富勒烯抗铁剂量的分子方向和磁结构在富勒烯抗Fiferromagnetswe中具有系统性合成（NH_3）A_3c_3 c_3c_3c_3c_3 c_3 c_3 c_3 c_3c_3c_3 c_3c_3c_3c_3c_3c_3c_3c_3c_3c_3c_3c_3c_3c_3c_3c_3c_3c_3c_3c_3c_3 c_3c_3c_3c_3c_3c_3 c_3 c <<60）进入A_3C_ <60>超导体，发现所有单氨基化合物都是抗铁磁绝缘子。 （NH_3）A_3C_ <60…More>通过A_3C60的FCC单元的轻微变形得出的正骨单位单元，并且由于这种变形，该电子位于C_ <60>部分。此外，磁结构和分子取向分别通过NMR确定，中子散射实验。这些之间的相关性表现出与过渡金属氧化物磁体中的轨道和自旋顺序之间的关系的很好的类比，这被称为kanamori-goodenough统治。（3）已经研究了稀土金属金属掺杂富勒烯的新型二聚体结构。其中，我们成功地合成了单相SM_3C_ <70>，并通过MEM/RIETVELD分析来确定电子密度水平的晶体结构。发现两个相邻的C_ <70>部分由SM ION连接，形成了一种新型的二聚体结构。这种二聚体结构是小心稳定的，因为该结构至少保持在850k的水平，与传统的富勒烯聚合物中的键断裂相反，显示键在600K以下的键断裂。（4）La@C_ c_ <82>薄膜的介电特性具有金属la@c_@c_@c_@c_ <82> diectric and diectric and a a a Funcort a a Funcort a a a Funcort a a a Funcort a a a Funcort a a Figint and and dieectric and a andertric and a andectric，室温下的饮食常数约为40，大约比C_ <60>（4.4）大的订单大。适当大的饮食常数大概是由于分子旋转的饮食时刻大。 LA@C_ <82>的这种偶极活性可能表明分子旋转状态可以由外部电子场控制。较少的

项目成果

F. Simon, A. Janossy, F. Muranyi, T. Feher, H. Shimoda, Y. Iwasa, and L. Forro: "Magnetic resonance in the antiferromagnetic and normal states of NH3K3C60."Phys. Rev. B61, Rapid Communications. 3826-3829 (2000)

F. Simon、A. Janossy、F. Muranyi、T. Feher、H. Shimoda、Y. Iwasa 和 L. Forro：“NH3K3C60 反铁磁状态和正常状态下的磁共振。”

K. Iizumi, Y. Uchino, K. Ueno, A. Koma, K. Saiki, Y. Inada, K. Nagai, Y. Iwasa, and T. Mitani: "Investigation of epitaxial arrangement and electronic structure of a La@C82 film grown on an MoS2 surface."Phys. Rev.. B62. 8281-8285 (2000)

K. Iizumi、Y. Uchino、K. Ueno、A. Koma、K. Saiki、Y. Inada、K. Nagai、Y. Iwasa 和 T. Mitani：“La@C82 的外延排列和电子结构的研究

C. M. Brown et al.: "Structural and electronic properties of noncubic super…"Phys. Rev. Lett.. 83. 2258-2261 (1999)

C. M. Brown 等人：“非立方超晶体的结构和电子特性……”Phys. Rev. Lett.. 83. 2258-2261 (1999)

T.Ozaki, Y.Iwasa, T.Mitani: "Stiffness of single walled carbon nanotubes under large strain"Phys.Rev.Lett.. 84. 1712-1715 (2000)

T.Ozaki、Y.Iwasa、T.Mitani：“大应变下单壁碳纳米管的刚度”Phys.Rev.Lett.. 84. 1712-1715 (2000)

C.J.Nuttall,Y.Inada,K.Nagai, and Y.Iwasa: "Low temperature bistability in the magnetic properties of solvent-including lanthanide metallofullerence crystals."Phys.Rev.. B62. 8592-8595 (2000)

C.J.Nuttall、Y.Inada、K.Nagai 和 Y.Iwasa：“含溶剂的镧系金属富勒晶体的磁性的低温双稳定性。”Phys.Rev.. B62。