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Direct Atomic Structure-Analysis and Properties of New Nano- and Solid-Clusters

新型纳米和固体团簇的直接原子结构分析和性质

基本信息

批准号：
11450250
负责人：
OKU Takeo
金额：
$ 9.73万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
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/en/grant/KAKENHI-PROJECT-11450250/
关键词：
Fullerene Cluster Carbon BN HREM Atomic Structure Electronic State Firse Principle calculation C

项目摘要

BCN nanocage fullerene materials were synthesized by arc-melting,electron-beam irradiation, chemical reaction, and self-organization. Atomic structures and structural stability of these materials were investigated by HREM, image simulation, EDS, electron energy-loss spectroscopy (EELS), and theoretical calculations. Atomic structure models of BN metallofullerenes with La and Fe atoms were proposed. New tetrahedral and elliptical carbon onions were produced by electron-beam irradiation, and atomic and electronic structure models were proposed. Possibility of hydrogen gas storage was calculated by molecular dynamics, and Ar atoms were stored in the BN nanocage materials. PL and STM measurements of BN nanocapsules at room temperature showed the I-V characteristics with Coulomb staircase-like behavior. SQUID measurement of BN nanocapsules also showed superparamagnetic property. A fabrication technique for self-assembled nanowires and cluster-protected quantum dots at scales under the limit … More s of current lithography was developed. The present work indicates that the new BN and C nanocage fullerene materials with various atomic structure and properties can be produced by various synthesis methods, which are expected as the future nanoscale devices.Advanced new ceramic materials are expected to be available for use as new energy and information materials, on which devices for solving energy and information problems will be based. The properties of these new materials will be strongly dependent on the atomic arrangements, the direct atomic analysis of which will have been contributed to by HREM.In addition to such direct atomic observation, information from such methods as nano-electron diffraction, EELS energy dispersive X-ray spectroscopy (EDX) and electron holography has being combined recently by progress with the electron gun. It will soon be possible to clarify atomic arrangement, composition, electronic state and magnetic structure of the nano-regions in these advanced materials. Less

采用电弧熔炼、电子束辐照、化学反应、自组织等方法合成了BCN纳米笼状富勒烯材料。用高分辨电子显微镜、图像模拟、能谱、电子能量损失谱(EELS)和理论计算研究了这些材料的原子结构和结构稳定性。提出了含La、Fe原子的BN金属富勒烯的原子结构模型。利用电子束辐照制备了新的四面体和椭圆形碳洋葱，并提出了原子结构和电子结构模型。用分子动力学方法计算了储氢的可能性，认为Ar原子储存在BN纳米笼材料中。室温下对BN纳米胶囊的PL和STM测量表明其具有库仑阶梯行为的I-V特性。对BN纳米胶囊的SQUID测量也显示出超顺磁性。极限…下规模自组装纳米线和团簇保护量子点的制备技术更多的是发展了S现在的光刻技术。目前的工作表明，通过各种合成方法可以制备出具有不同原子结构和性质的新型BN和C纳米笼富勒烯材料，有望成为未来的纳米器件；先进的新型陶瓷材料有望作为新的能源和信息材料，为解决能源和信息问题的器件提供基础。这些新材料的性质将强烈依赖于原子排列，而HREM将有助于原子排列的直接分析。除了这种直接原子观察之外，最近通过与电子枪的进展，将纳米电子衍射、电子能谱(EDX)和电子全息术等方法的信息结合在一起。很快就有可能弄清楚这些先进材料中纳米区域的原子排列、组成、电子状态和磁结构。较少