| Research Abstract |
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
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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
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