High energy-resolution EELS study of the electronic structure of nanotubes

纳米管电子结构的高能量分辨率 EELS 研究

• 批准号: 10640295
• 负责人: TERAUCHI Masami
• 金额: $ 2.43万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640295/
• 关键词: EELS; nanotube; electronic structure; BN nanotubes; ナノチュープ; BNコーン; BNナノチューブ; バンドギャップ

Results obtained are as follows.(1) The special resolution of a high energy-resolution EELS microscope was greatly impoved from 180nm to 35nm in diameter by using an aperture of 1μm in diameter.(2) EELS spectra were obtained from a tip and a body areas of one carbon nanotube. It was revealed that the density of stated of the π*-band is different from that of graphite.(3) EELS spectra were obtained from single BN nanotubes. It was found that the bandgap energies of BN nanotubes were smaller than that of hexagonal BN by an amount of 0.7eV. Intensity distributions of the plasmon peak were well explained not by a volume loss-function but by a surface loss-function.(4) EELS spectra of dimer-, one-dimensional- and two-dimensional-polymerized CィイD260ィエD2 were obtained from single crystalline areas for the first time. The bandgap energies of the materials were smaller than that of monomer CィイD260ィエD2 single crystal by an amount of 0.1-0.3eV. Intensity distributions of π to π* interband transitions was broader than that of monomer CィイD260ィエD2. Those results were explained by a deformation of CィイD260ィエD2 cluster due to the polymerization.

获得的结果如下。(1)采用直径为1μm的光阑，使高能分辨EELS显微镜的比分辨率从180 nm提高到35 nm。(2)EELS光谱从一个碳纳米管的尖端和主体区域获得。结果表明，石墨的π ~* 带态密度与石墨的不同。(3)EELS光谱从单个BN纳米管获得。结果表明，BN纳米管的禁带宽度比六方BN的禁带宽度小0.7eV。等离子体激元峰的强度分布很好地解释了体积损失函数，但由表面损失函数。(4)首次从单晶区获得了二聚体、一维和二维聚合的C_（60）D_（260）D_（260）D_2的EELS谱。材料的禁带宽度比单体C_（60）D_（260）D_2单晶的禁带宽度小0.1-0.3eV。π到π* 带间跃迁的强度分布比单体C_（260）C_（260）C_（260）D_2的宽。这些结果被解释为由于聚合导致的C_xD_260_xD_2簇的变形。

项目成果

M. Terauchi: "High energy-resolution electron energy-loss spectroscopy study on Sr-doping dependence of the electronic structure of LaィイD22-xィエD2SrィイD2xィエD2CuOィイD24ィエD2"Micron. 30. 371-377 (1999)

M. Terauchi：“LaD22-xD2SrD2xD2CuOD24D2 电子结构的 Sr 掺杂依赖性的高能量分辨率电子能量损失光谱研究”Micron 30 .371-377 (1999)。

H.Hirai: "Band Gap of essentially fourfold-coordinated amorphous diamond Synthesized from C60 fllerene"Phys. Rev. B. 60. 6357-6361 (1999)

H.Hirai：“由 C60 flerene 合成的本质上四重配位的非晶金刚石的带隙”Phys。

M.Terauchi: "Electron energy-loss spectroscopy of the electronic structure of boron nitride nanotube"J. Electron Microscopy. 74. 319-324 (1998)

M.Terauchi：“氮化硼纳米管电子结构的电子能量损失光谱”J。

M.Terauchi et al: "Electron energy-loss spectroscopy of the elecrtonic structure of boron nitride nanotubes" J.Electron Microscopy. 74(4). 319-324 (1998)

M.Terauchi 等人：“氮化硼纳米管电子结构的电子能量损失光谱”J.Electron Microscopy。

M.Terauchi: "Development of a high energy resolution electron energy-loss Spectroscopy microscope"J. Microscopy. 194. 203-209 (1999)

M.Terauchi：“高能量分辨率电子能量损失光谱显微镜的开发”J。